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Verified answer
(cos x+sin x)^2= (cos x)^2 + (sin x)^2 + 2.sinx.cos x
= ( (cos x)^2 + (sin x)^2 ) + 2.sin x.cos x
= 1 + 2.sinx.cosx atau 1+2.cosx.sinx
(terbukti)
Ingat!
(cos x)^2 + (sin x)^2 = 1
Semoga membantu :)
Centang terbaik ya
a = cos x
b = sin x
(cos x + sin x)²
= cos² x + sin² x + 2 cos x sin x
= 1 + 2 cos x sin x