Sum and Difference Identities For Tangent - Pre-Calculus

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Question

According to the trigonometric identities,

Answer

The trigonometric identity , is an important identity to memorize.

Some other identities that are important to know are:

$\frac{sin(x)}{cos(x)}=tan(x)$

$cot(x)=\frac{1}{tan(x)}$

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