Trigonometry
Find the exact value of sin(x+y)\sin\left(x+y\right)sin(x+y) . Use a trigonometric identity.
sinx=20101\sin x=\frac{20}{101}sinx=10120, siny=−2129\sin y=-\frac{21}{29}siny=−2921, xxx in quadrant I and yyy in quadrant III
79101\frac{79}{101}10179
15602929\frac{1560}{2929}29291560
−24792929-\frac{2479}{2929}−29292479
−24002929-\frac{2400}{2929}−29292400