What is expand (-sin(t)+cos(t))*(-cos(t)-sin(t)) ?

The solution to expand (-sin(t)+cos(t))*(-cos(t)-sin(t)) is -cos(2t)

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expand (-sin(t)+cos(t))*(-cos(t)-sin(t))

expand

(- sin (t) + cos (t)) \cdot (- cos (t) - sin (t))

- cos (2 t)

Solution steps

(- sin (t) + cos (t)) (- cos (t) - sin (t))

Apply Difference of Two Squares

(- sin (t) + cos (t)) (- cos (t) - sin (t)) : - cos (2 t)

= - cos (2 t)

(1 + \frac{1}{s ^{2}}) (\frac{s ^{3}}{2})

(e^{- 3 (x - y)} + cos (x - y)) (e^{- 3 x} + e^{2 x})

1 + \frac{81}{20} (3 x - 2)

\frac{\partial}{\partial t} ((y) ((y - 10) (40 - y)))

- \frac{2 ( q - 15 )}{5}

What is expand (-sin(t)+cos(t))*(-cos(t)-sin(t)) ?
The solution to expand (-sin(t)+cos(t))*(-cos(t)-sin(t)) is -cos(2t)