Establish the identity. Follow the format. - 1) sin (x + y) sin (x - y)...

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Establish the identity. Follow the format. - 1) sin (x + y) sin (x - y) = 2 cos x sin y 'se the information given about the angle 0 to find the exact value of the indicated trigonometric function. 2) a) Find the exact value of cos, given that cos 0=- 5 and 0 terminates in 270 <0 <360. b) Justify the choice of the sign in front of the radical. Establish the identity. Follow the format. - 1) sin (x + y) sin (x - y) = 2 cos x sin y 'se the information given about the angle 0 to find the exact value of the indicated trigonometric function. 2) a) Find the exact value of cos, given that cos 0=- 5 and 0 terminates in 270 <0 <360. b) Justify the choice of the sign in front of the radical.