Gunakan konsep rumus cosinus jumlah dua sudut, perbandingan sisi trigonometri, relasi sudut
.
![table attributes columnalign right center left columnspacing 2px end attributes row cell cos space open parentheses alpha plus beta close parentheses end cell equals cell cos space alpha times cos space beta minus sin space alpha times sin space beta end cell row cell sin space alpha end cell equals cell fraction numerator sisi space depan space alpha over denominator sisi space miring space alpha end fraction end cell row cell cos space alpha end cell equals cell fraction numerator sisi space samping space alpha over denominator sisi space miring space alpha end fraction end cell row cell sin space open parentheses 180 degree minus alpha close parentheses end cell equals cell sin space alpha end cell row cell cos space open parentheses 180 degree minus alpha close parentheses end cell equals cell negative cos space alpha end cell end table](data:image/png;base64,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)
Diketahui
dan
dengan
lancip dan
tumpul. Akan ditentukan nilai
.
*Menentukan nilai
, dengan
sudut lancip.
Terlebih dahulu tentukan sisi samping dan sisi miring sudut
dari
.
![table attributes columnalign right center left columnspacing 2px end attributes row cell cos space straight A end cell equals cell 12 over 13 end cell row cell fraction numerator sisi space samping space straight A over denominator sisi space miring space straight A end fraction end cell equals cell 12 over 13 end cell row cell sisi space samping space straight A end cell equals 12 row cell sisi space miring space straight A end cell equals 13 end table](data:image/png;base64,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)
Diperoleh sisi samping dan sisi miring sudut
adalah
dan
. Dengan menggunakan tripel Pythagoras
, sehingga sisi lainnya atau sisi depan dari sudut
adalah
. Nilai
dapat dihitung sebagai berikut.
![sin space straight A equals fraction numerator sisi space depan space straight A over denominator sisi space miring space straight A end fraction equals 5 over 13](data:image/png;base64,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)
Diperoleh
.
*Menentukan nilai
, dengan
sudut tumpul.
Karena
tumpul, maka nilai
dan nilai
.
Misal
, dengan
adalah sudut lancip, maka diperoleh:
![sin space straight B equals sin space open parentheses 180 degree minus alpha close parentheses equals sin space alpha equals 8 over 17](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAOcAAAAkCAYAAAByiC06AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAABGJhU0UAAAATRJrTQAAAA9NJREFUeNrtm0FIFFEYxx+LLCEihIh0CEFEIiIECQ8h0S1EJAKJiIhF2INEp0AkOnTz1CFEiOgQIkJ0iD1EEJ0iootIRIQQIREiXUJERITt+9j/0jTO7r6ZnZk3o/8f/JEZ3dn3vjffe9/7vqcxhJAk6RY9Em2J9kXbomXRIE1DiFveioZFBVwXcL1O0xDilt+ik757er1J0xDilnHRJ9EIri+KPotu0DSEuOeeqIpVVH/epkkIcc8l0VfRqKhLdEH0FPcJIQ5ZEw347p2Aw5IYmRPdP2b9neOwt4WWTwq+ex2iXZomPiZFK46+e0a0Y2o1spmUv3sZfSfReCW663HQDkzwz+N4eDWmZ6j2MGO8Q+ydBnG0Xw36XdTjuz8keoDQJQjbArRm8FbxN/qsMd/v9XOnER5tp/xyaZ+1JlfM0XhlCd1nPja1ZNCB6JdoPkV7hjK4ziB3RD9zZOBpGNjPkqjU5IWyKUCrw30z/1LtI/i9d5+yA4fud+CcBn2f5iJ4NKkGrERbOWr/S9FEhNnepgC9EPDil3C/Tln0B45ZdtD/CdiAOOAaVrKDgBct6HoIq4KGqD9MrdBq45wFhLO6d5tqEQI3kov2byE8CeucNgVoDZd7A0LJjRTG/Sz2RLuIZpQ+0RNfEqMTE01exits/9rpS+JsI2SyefH0+ovoKjo4ijjaZs9ZL8Rezln7D9rYJ7UqQDd69n6EPX2Yl0oniGfY+1zH9xXR3nbb43q8ovQvs+ieZ9bU6i82xhoMuYmvejbHZYR14zlqf1TntClAN3r2XgpJng7PPc0eVkTnU3DOpMcrSv/a3bbFqf84I/oAp7liYSwT0TnrDCOci2sVSLr9+tzuCM5pU4BeDwhre5vYJw6mzOFU/i2E3EF0NckRZHG8wvYv02Gtd4+0mYJzJrUyJNX+qAkhmwL0AhJA/oTQYsI5hkXfhLGGFa0zxYRQUuMVtn+54FwKznkK+673OWp/o1JKq8/bFKDrpZRhXI9i1RxIcJw1Y/wRK6LWT9+gnRUTnA0OmkCyPF5h+5dp6sv2RoJhrfcgQgVOmpf2FxF+9liEQf5w0KYAPYaZXVfaVXP4EEISjGFSUJvdxL1JvNRe+vB3xRyNV5j+kSOAy+N7LuHxPZILjttBcD2aOMthD0WrI52ZTDYRchxodaQzaMs0T7MRkh62zqmrbD/NRUi2nFPrvQ9pKkKy55yvTfPDLYQQB85Z4qpJSPacUw+lBP03EiHEsXPq2d8VmoiQ7DnnC1P7FzhCSMpO2eqAgR7nZCKIEEIIIYQQQgghhBBCcsFfbhKgXfx8DAYAAAFWdEVYdE1hdGhNTAA8bWF0aCB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMTk5OC9NYXRoL01hdGhNTCI+PG1pPnNpbjwvbWk+PG1vPiYjeEEwOzwvbW8+PG1pIG1hdGh2YXJpYW50PSJub3JtYWwiPkI8L21pPjxtbz49PC9tbz48bWk+c2luPC9taT48bW8+JiN4QTA7PC9tbz48bWZlbmNlZD48bXJvdz48bW4+MTgwPC9tbj48bW8+JiN4QjA7PC9tbz48bW8+LTwvbW8+PG1pPiYjeDNCMTs8L21pPjwvbXJvdz48L21mZW5jZWQ+PG1vPj08L21vPjxtaT5zaW48L21pPjxtbz4mI3hBMDs8L21vPjxtaT4mI3gzQjE7PC9taT48bW8+PTwvbW8+PG1mcmFjPjxtbj44PC9tbj48bW4+MTc8L21uPjwvbWZyYWM+PC9tYXRoPsia74YAAAAASUVORK5CYII=)
Kemudian tentukan sisi depan dan sisi miring sudut
dari
.
![table attributes columnalign right center left columnspacing 2px end attributes row cell sin space alpha end cell equals cell 8 over 17 end cell row cell fraction numerator sisi space depan space alpha over denominator sisi space miring space alpha end fraction end cell equals cell 8 over 17 end cell row cell sisi space depan space alpha end cell equals 8 row cell sisi space miring space alpha end cell equals 17 end table](data:image/png;base64,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)
Diperoleh sisi depan dan sisi miring sudut
adalah
dan
. Dengan menggunakan tripel Pythagoras
, sehingga sisi lainnya atau sisi samping dari sudut
adalah
. Nilai
dapat dihitung sebagai berikut.
![cos space alpha equals fraction numerator sisi space samping space alpha over denominator sisi space miring space alpha end fraction equals 15 over 17](data:image/png;base64,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)
Diperoleh nilai
. Sehingga nilai
dapat dihitung sebagai berikut.
Diperoleh nilai
, sehingga nilai
dapat dihitung sebagai berikut.
Diperoleh nilai
.
Jadi, jawaban yang tepat adalah A.