Buktikan idenritas trigonometri berikut a.sin x cosec x - sin2 x =cos2 x b.(cosec x + cotan x)(1 - cos x) = sin x

Question

Matematika Diposting : 2017-04-12 Diupdate : 2020-02-15 seniratnaayu111

Pertanyaan

Buktikan idenritas trigonometri berikut
a.sin x cosec x - sin2 x =cos2 x
b.(cosec x + cotan x)(1 - cos x) = sin x

Answer 1

saya yg a)
= sinx(1/sinx) - sin²x
= 1 - sin²x
= cos²x

Answer 2

>>>>A<<<<
= sinx(1/sinx) - sin²x
= 1 - sin²x
= cos ²
jadi jawabannya yg A