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[SPMB 2006] Jika sudut lancip memenuhi sin α = 3 1 ​ 3 ​ , maka ....

[SPMB 2006]
Jika sudut lancip a memenuhi , maka tan open parentheses 1 half pi minus alpha close parentheses plus 3 cos space alpha equals....

  1. 3 square root of 2 minus square root of 3

  2. 3 square root of 2 plus square root of 3

  3. square root of 6 plus square root of 2

  4. square root of 6 minus square root of 2

  5. square root of 3 plus square root of 2

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Pembahasan

Dari , dapat dibuat segitiga berikut: Maka:

Dari sin space alpha equals 1 third square root of 3, dapat dibuat segitiga berikut:


cos space alpha equals fraction numerator space square root of 6 over denominator 3 end fraction tan space alpha equals fraction numerator square root of 3 over denominator square root of 6 end fraction equals fraction numerator 1 over denominator square root of 2 end fraction cot space alpha equals fraction numerator 1 over denominator tan space alpha end fraction equals square root of 2

 

Maka:
tan open parentheses 1 half pi minus alpha close parentheses plus 3 cos space alpha equals cot space alpha plus 3 cos space alpha equals square root of 2 plus 3 open parentheses fraction numerator space square root of 6 over denominator 3 end fraction close parentheses equals square root of 2 plus square root of 6

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[SBMPTN 2011] Jika cos x = 2 sin x , maka sin x cos x adalah....

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