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If a and b are two angles in standard position in Quadrant I, find cos(a-b) for the given function values. sin a=4/5 and cos b=5/13

1) -33/65

2) 33/65

3) -63/65

4) 63/65

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Answer:

If a and b are two angles in standard position in Quadrant I, find cos(a-b) for the given function values. sin a=4/5 and cos b=5/13

1) -33/65

2) 33/65

3) -63/65

4) 63/65

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