Geometry

Sum and Difference Trigonometric Formulas

Sine - Sum and Difference Formulas

         

Which of the following is equal to

sin56cos17cos56sin17? \sin 56 ^ \circ \cos 17 ^ \circ - \cos 56 ^ \circ \sin 17 ^ \circ ?

sin43cos82+cos43sin82=sinN \sin 43 ^ \circ \cos 82 ^ \circ + \cos 43 ^ \circ \sin 82 ^ \circ = \sin N ^\circ , where 0N90 0 \leq N \leq 90 . What is the value of NN?

Which of the following is equal to

sin29cos31+cos29sin31? \sin 29 ^ \circ \cos 31 ^ \circ + \cos 29 ^ \circ \sin 31 ^ \circ ?

Using the Sine sum formula, what is the value of

sin75? \sin 75 ^ \circ ?

sin21cos37+cos21sin37=sinN \sin 21 ^ \circ \cos 37 ^ \circ + \cos 21 ^ \circ \sin 37 ^ \circ = \sin N ^\circ , where 0N90 0 \leq N \leq 90 . What is the value of NN?

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