What is expand (1+cos(a))(1-cos(a)) ?

The solution to expand (1+cos(a))(1-cos(a)) is sin^2(a)

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expand (1+cos(a))(1-cos(a))

expand

(1 + cos (a)) (1 - cos (a))

sin^{2} (a)

Solution steps

(1 + cos (a)) (1 - cos (a))

Apply Difference of Two Squares

(1 + cos (a)) (1 - cos (a)) : sin^{2} (a)

= sin^{2} (a)

(x - \frac{1}{x})^{4}

\frac{1}{3} + \frac{2}{9} (0.9 - 1)

\frac{2 ( 2 x ^{2} - x + 3 )}{x}

(sin (3 t) + cos (3 t))^{2}

ln^{x^{2}} (x) (2 x ln (ln (x)) + \frac{x}{ln ( x )})

What is expand (1+cos(a))(1-cos(a)) ?
The solution to expand (1+cos(a))(1-cos(a)) is sin^2(a)