How do you find the exact value of #sin(u+v)# given that #sinu=-7/25# and #cosv=-4/5#?
1 Answer
Feb 28, 2017
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Explanation:
Use trig identity:
sin (u + v) = sin u.cos v + sin v.cos u
We know:
We can't determine cos u because we don't know which Quadrant angle u is in.
The same problem with sin v.