Geometry
# Sum and Difference Trigonometric Formulas

Which of the following is equal to

\[ \sin 56 ^ \circ \cos 17 ^ \circ - \cos 56 ^ \circ \sin 17 ^ \circ ? \]

Which of the following is equal to

\[ \sin 29 ^ \circ \cos 31 ^ \circ + \cos 29 ^ \circ \sin 31 ^ \circ ?\]

Using the Sine sum formula, what is the value of

\[ \sin 75 ^ \circ ?\]

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