Question

Buktikan identitas berikut:
CosA/1-tanA - sin^2 A/cosA - sinA = cos A + sin A

Answer 1

C / ( 1-s/c)  - s^ 2 / (c-s) =
c / (c/c  - s/c)  - s^2 / (c-s) =

c^2 / (c-s)  - s^2 / (c-s) =

(c^2 - s^2 ) / (c-s) =

(c-s)(c+s) / (c-s) = c+ s terbukti kiri = kanan

s = sin x
c = cos x
disingkat biar cepat ringkas dan muda dibaca ok