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21-10-2022
Mathematics

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If sin A 0.3, cos A = 0.7, sin B = (1/√5)
and cos B: (-1/√5) find the exact value of cos(A - B).

(i know the answer but i want to know how to solve it as well)

If sin A 03 cos A 07 sin B 15 and cos B 15 find the exact value of cosA B i know the answer but i want to know how to solve it as well class=

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