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

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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

Jawaban Terkonfirmasi

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