If cos a = 0.791 and cos 8 = 0.517 with both angles' terminal rays in...

Question:

If cos a = 0.791 and cos 8 = 0.517 with both angles' terminal rays in Quadrant-I, find the values of sin(a + b) = -9933 (b) sin( -a) = 3607 Your answers should be accurate to 4 decimal places.

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