If A and B are in quadrant 1 and sin A= 2/5 and sin B= 10/11 find :
1) cos (A-B)
2) sin (A+B) ; sin (A-B)
3) cos (2A) ; sin (2A)
4) cos (A/2) ; sin (A/2)
I know that since we are given sin A and sin B we would just plug in for the questions regarding sin; however, I am not certain that is correct.
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