4. Let tano = with 0 in QI. 12 sec20 =

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A: Here I am providing my handwritten solution

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A: topic - angle between vectors

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Q: 3 cos B 25 If sin a and both a and 3 are in Quadrant III, find 5 -- (a) cos(a – 3) (b) sin(a – B)

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A: Topic = Trigonometry