Pertanyaan

Jika cos x = 2 sin x , maka nilai sin x cos x adalah ....

Jika $cos x = 2 sin x$ , maka nilai $sin x cos x$ adalah ....

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Dicari sisi miringnya:

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Dicari sisi miringnya:

$begin mathsize 14px style Sisi space miring equals square root of 1 squared plus 2 squared end root equals square root of 5 sin space x equals fraction numerator sisi space depan over denominator sisi space miring end fraction equals fraction numerator 1 over denominator square root of 5 end fraction cos space x equals fraction numerator sisi space samping over denominator sisi space miring end fraction equals fraction numerator 2 over denominator square root of 5 end fraction sin space x space cos space x equals fraction numerator 1 over denominator square root of 5 end fraction middle dot fraction numerator 2 over denominator square root of 5 end fraction equals 2 over 5 end style$