(1+sin x) ( 1- sin x)= cos^2x mohon dibantu ya

[tex](1 + \sin(x) )(1 - \sin(x) ) = \cos ^{2} (x) \\ 1 - \sin(x) + \sin(x) - \sin^{2} (x) = \cos ^{2} (x) \\ 1 - \sin^{2} (x) = \cos ^{2} (x) \\ \cos^{2} (x) = \cos^{2} (x) [/tex]
Terbukti

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