Sum to product

Use product to sum or sum to product identity to complet the simplification show below.

sin(51)+sin(9)=sin(a) where the exact value of a with 0degrees less than a less than 90degrees is A=

asked Jul 7, 2016 in PRECALCULUS by anonymous

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The trigonometric equation is .

Sum to product property: .

By using sum to product formula of trigonometric simplify the equation.

The exact value of .

answered Jul 8, 2016 by Anney Mentor

The exact value of .

commented Jul 9, 2016 by Anney Mentor

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