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)

(1 + 3 i)^{5}

(a - b)^{2}

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

(x + 22)^{2}

(- 3 - i)^{4}

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