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Matematika
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1 Jawaban
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1. Jawaban Anonyme
jawab
5.
sin θ /(1 + cot² θ) =
= (sin θ) / (1 + cos² θ/sin² θ) ...kalikan sin² θ/ sin² θ
= (sin ³ θ) / (sin² θ + cos²θ)
= sin³ θ /(1)
= sin³ θ
6.
sin θ/cos θ +cos θ/sin θ =
= (sin² θ + cos² θ) /(sin θcos θ)
= 1/ (1/2 )(2 sin θ cos θ)
= 1 /(1/2)(sin 2θ)
= 2 / sin 2θ