Question

$sin^2x - cos^2x$
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Answer 1

Step-by-step explanation:

sin^2x-cos^2x=1

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Answer 2

Answer:

The formulas that we use here are:-

sin^2x+cos^2x=1

sin^2x=1- cos^2x

cos^2x=1- sin^2x

sinx/cosx=tanx

Step-by-step explanation:

$\sin {}^{2} x - \cos {}^{2} x \\ 1 - \cos ^{2} x - \cos {}^{2} x \\ 1 - 2 \cos {}^{2} x \\ or \\ sin {}^{2} x - \cos {}^{2} x \\ \sin {}^{2} x - (1 - \sin {}^{2}x) \\ 2 \sin {}^{2} x - 1 \\ or \\ \sin {}^{2} x - \cos {}^{2} x \\ \frac{ \sin^{2} x - \cos {}^{2}x }{1} \\ \frac{ \sin {}^{2} x - \cos {}^{2} x }{ \sin {}^{2} x + \cos {}^{2}x } \\ dividing \: the \: whole \: equation \: by \: \cos {}^{2} x \: we \: get \\ \frac{ \tan {}^{2} x - 1 }{ \tan {}^{2} x + 1 }$