Sines and Pythagorean TriplesPro Problems > Math > Algebra > Functions > Trigonometry > Sum and Difference of Angles > Sine
Sines and Pythagorean Triples
If sin A =
and sin B =
, and both A and B lie in the first quadrant, find the value of sin (A + B).
Problem by Mr. Twitchell
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sin(45 + A) =
. Calculate cos(2A).
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