Algebra Examples

$\cos (2 x) + 1$

Use the double-angle identity to transform $\cos (2 x)$ to $2 \cos^{2} (x) - 1$ .

$2 \cos^{2} (x) - 1 + 1$

Combine the opposite terms in $2 \cos^{2} (x) - 1 + 1$ .

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Add $- 1$ and $1$ .

$2 \cos^{2} (x) + 0$

Add $2 \cos^{2} (x)$ and $0$ .

$2 \cos^{2} (x)$