What is expand (2cos(x)-1)(2cos(x)+1) ?

The solution to expand (2cos(x)-1)(2cos(x)+1) is 4cos^2(x)-1

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expand (2cos(x)-1)(2cos(x)+1)

expand

(2 cos (x) - 1) (2 cos (x) + 1)

4 cos^{2} (x) - 1

Solution steps

(2 cos (x) - 1) (2 cos (x) + 1)

Apply Difference of Two Squares

(2 cos (x) - 1) (2 cos (x) + 1) : 4 cos^{2} (x) - 1

= 4 cos^{2} (x) - 1

4 (x + h) - 3 - 4 x - 3

x^{s i n (x)} (cos (x) ln (x) + \frac{sin ( x )}{x})

\frac{d}{d x} (x^{4} - 2 x^{3} - 4 x^{2} - 5 x + 2)

(\frac{1}{x} - x) (y - \frac{1}{y})

(6 x^{2} - 7 y^{2}) d x - 14 x y d y

What is expand (2cos(x)-1)(2cos(x)+1) ?
The solution to expand (2cos(x)-1)(2cos(x)+1) is 4cos^2(x)-1