Penjelasan dengan langkah-langkah:
θ = a
c] (sin a + cos a)² + (sin a - cos a)²
= sin² a + cos² a + 2 sin a . cos a + sin² a + cos² a - 2 sin a . cos a
= 1 + 1 + 2 sin a . cos a - 2 . sin a . cos a
= 2
d] (sin x . cos x)/tan x
= sin x . cos x . cos x/sin x
= cos² x
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Penjelasan dengan langkah-langkah:
θ = a
c] (sin a + cos a)² + (sin a - cos a)²
= sin² a + cos² a + 2 sin a . cos a + sin² a + cos² a - 2 sin a . cos a
= 1 + 1 + 2 sin a . cos a - 2 . sin a . cos a
= 2
d] (sin x . cos x)/tan x
= sin x . cos x . cos x/sin x
= cos² x