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# Sum and Difference Trigonometric Formulas

These formulas explain how to add and subtract trigonometric functions (and their arguments). If you've got sum time, see what a difference these formulas will make for your trig toolkit.

# Sum to Product Trigonometric Identities

Which of the following is equal to $$\cos114^\circ+\cos44^\circ?$$

Which of the following is equal to $$\cos88^\circ-\cos42^\circ?$$

Which of the following is equal to $$\sin60^\circ+\sin16^\circ?$$

Evaluate $$16\sin120^\circ+8\cos105^\circ+16\sin60^\circ+8\cos15^\circ.$$

Which of the following expressions is equal to $\sin{36 ^\circ} + \sin{24 ^\circ} ?$

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