Question: 8) sin = 3/5 , lies in quadrant II, and cos = 2/5 , lies in quadrant I Find cos ( - ). 9) tan

8) sin = 3/5 , lies in quadrant II, and cos = 2/5 , lies in quadrant I Find cos ( - ).

9) tan = 24/7 , lies in quadrant III, and cos = - 3/5 , lies in quadrant II Find sin ( + ).

10) cos = - 4/5 , lies in quadrant III, and sin = 21/5 , lies in quadrant II Find cos ( + ).

so confused on how to solve these kind of problems

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