Three Angle Sum
Pro Problems > Math > Algebra > Functions > Trigonometry > Sum and Difference of Angles > CosineThree Angle Sum
X,Y, and Z are all first quadrant angles, and the following are given:
sin(X) =12
13
4
5
22
Calculate cos(X + Y + Z)
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Problem by Mr. Twitchell
Solution
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X and Y Angles
If sin(X) = and cos(Y) = , and neither X nor Y lie in the first quadrant, find cos(X + Y)
3
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