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if sinx=7/5 and angle x is in quadrant 2 and cos y=12/13 and angle y is in quadrant 1 find sin (x+y)

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please Help!

double-angle
half-angle-identity

asked Nov 26, 2013 in TRIGONOMETRY by harvy0496 Apprentice

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1 Answer

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sin(x) is ratio of opposite side / hypotenuse

In this case sin(x) = 7/5

But length of hypotenuse is always greater than opposite side length.

answered Aug 18, 2014 by david Expert

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