What is cos^2(t)-sin^2(t) ?

The solution to cos^2(t)-sin^2(t) is cos(2t)

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simplify cos^2(t)-sin^2(t)

simplify

cos^{2} (t) - sin^{2} (t)

cos (2 t)

Solution steps

cos^{2} (t) - sin^{2} (t)

Use the Double Angle identity:

cos^{2} (x) - sin^{2} (x) = cos (2 x)

= cos (2 t)

75 x^{3} - 27 x^{3}

\frac{cos ^{2} ( x )}{1 - sin ( x )}

\frac{x ^{2} - 2 x}{sin ( x )}

3 (1 + i)^{2}

2 cos (x) (- sin (x))