What is expand (cos(t)+cos(2t))^2 ?

The solution to expand (cos(t)+cos(2t))^2 is cos^2(t)+2cos(t)cos(2t)+cos^2(2t)

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expand (cos(t)+cos(2t))^2

expand

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

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

Solution steps

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

Apply Perfect Square Formula:

(a + b)^{2} = a^{2} + 2 ab + b^{2}

(cos (t) + cos (2 t))^{2} = cos^{2} (t) + 2 cos (t) cos (2 t) + cos^{2} (2 t)

= cos^{2} (t) + 2 cos (t) cos (2 t) + cos^{2} (2 t)

(e^{i x} + e^{- i x})^{4}

ln (1 + 2 x) + (e^{2 x - x^{2}} - 1) 3 x + 1

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

x^{4} (5 - x^{2}) d x

A (2, - 3) B (6, - 2)

What is expand (cos(t)+cos(2t))^2 ?
The solution to expand (cos(t)+cos(2t))^2 is cos^2(t)+2cos(t)cos(2t)+cos^2(2t)