What is expand (cos(4x)+cos(3x))^2 ?

The solution to expand (cos(4x)+cos(3x))^2 is cos^2(4x)+2cos(4x)cos(3x)+cos^2(3x)

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expand (cos(4x)+cos(3x))^2

expand

(cos (4 x) + cos (3 x))^{2}

cos^{2} (4 x) + 2 cos (4 x) cos (3 x) + cos^{2} (3 x)

Solution steps

(cos (4 x) + cos (3 x))^{2}

Apply Perfect Square Formula:

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

(cos (4 x) + cos (3 x))^{2} = cos^{2} (4 x) + 2 cos (4 x) cos (3 x) + cos^{2} (3 x)

= cos^{2} (4 x) + 2 cos (4 x) cos (3 x) + cos^{2} (3 x)

4 (1 - cos (θ))

sin (\frac{( 2 n - 1 ) π}{2})

(- 2 + 2 i 3)^{4}

\frac{( x - 1 ) ( x + 2 )}{2}

What is expand (cos(4x)+cos(3x))^2 ?
The solution to expand (cos(4x)+cos(3x))^2 is cos^2(4x)+2cos(4x)cos(3x)+cos^2(3x)