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

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

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expand (cos(a)+cos(b))(cos(a)-cos(b))

expand

(cos (a) + cos (b)) (cos (a) - cos (b))

cos^{2} (a) - cos^{2} (b)

Solution steps

(cos (a) + cos (b)) (cos (a) - cos (b))

Apply Difference of Two Squares Formula:

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

(cos (a) + cos (b)) (cos (a) - cos (b)) = cos^{2} (a) - cos^{2} (b)

= cos^{2} (a) - cos^{2} (b)

(A x + B) (x^{4} + 2 x^{3} + 5 x^{2} + 4 x + 4) (x^{6} + 3 x^{4} + 3 x^{2} + 1)

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

32 e^{t} \cdot U (t - 4)

3 - (2 - 3)^{2}

p^{\frac{1}{5}} (p^{\frac{4}{5}} + 4 p^{\frac{9}{5}})

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