Question

Buktikan bahwa:
a.(1-cos α)(1+cos α)=sin α.cos α.tan α
b.(sin α+cos α)²+(sin α-cos α)²=2

Answer 1

A. sin a cos a tan a
sin a cos a(sin a/ cos a)
sin a. sin a
sin² a
(1 - cos²a)
(1 - cos a)(1 + cos a) terbukti

b. (sin a + cos a)² + (sin a - cos a)²
sin²a + 2 sin a cos a + cos²a + sin²a - 2 sin a cos a + cos² a
2 sin²a + 2 cos²a
2(sin² a +cos²a)
2.1
2 terbukti