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begini mungkin soalnya (sin²x + tan²x)
x²
2
= 2(sin²x + tan²x)
x²
= 2(sin²xcos²x + sin²x)
x²cos²x
= 2(sin²x(cos²x + 1))
x²cos²x
= 2(1 - cos²x)(cos²x + 1)
x²cos²x
= -2(cos²x - 1)(cos²x + 1)
x²cos²x
= -2(cos²xcos²x - 1)
x²cos²x
= 2 - 2cos²xcos²x atau
x²cos²x
= 2 per x²cos²x - 2cos²x per x²