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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

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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