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Really Simple Trig Question

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\[\sin^4(x)-\cos^4(x) = \sin^2(x)-\cos^2(x)\]

Note by Yan Yau Cheng
3 years, 5 months ago

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Hint: \(a^2-b^2=(a+b)(a-b)\) and \(\sin^2 (x) +\cos^2 (x)=1\) :)

Mursalin Habib - 3 years, 5 months ago

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As good as a solution

Star Light - 3 years, 5 months ago

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