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Exercise

$\cos^2\left(u\right)-\sin^2\left(u\right)$

Step-by-step Solution

1

Applying the trigonometric identity: $\cos\left(\theta \right)^2-\sin\left(\theta \right)^2 = \cos\left(2\theta \right)$

$\cos\left(2u\right)$
Why is cos(2x) = cos(x)^2 - sin(x)^2 ?

Final answer to the exercise

$\cos\left(2u\right)$

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  • Verify if true (using algebra)
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