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

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

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

simplify

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

- cos (2 y)

Solution steps

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

Rewrite using trig identities

= - cos (2 y)

1 \frac{2}{9} \div 2 \frac{1}{5}

\frac{1}{3} i - (\frac{1}{4} - \frac{1}{6} i)

2 8 x^{3} (3 10 x^{4} - x 5 x^{2})

(2 x + 1)^{2} + (2 x - 3)^{2} - 8 x (x - 1)

\frac{87}{100} (\frac{1300}{11}) + 11