Roger D.

asked • 04/11/18

Evaluate the angles using sums as products or products as sums. (1) sin (75 degrees -15 degrees) 2) cos (65 degrees - 25 degrees)

Using either the sums as products or products as sums to work out the answer.

Mark M.

sin (75° - 15°) = sin 60°
Why futz with sum/difference formula?


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