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Sines and Pythagorean Triples

Pro Problems > Math > Algebra > Functions > Trigonometry > Sum and Difference of Angles > Sine
 

Sines and Pythagorean Triples

If  sin A =
3
5
 and  sin B =
5
13
, and both A and B lie in the first quadrant, find the value of sin (A + B).

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Problem by Mr. Twitchell

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Forty-five Plus A

sin(45 + A) =
17
2
26
. Calculate cos(2A).

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