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Find the exact value of tan under the given conditions

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Reference no: EM131017092

I need help understanding how to solve the following problem:

Find the exact value of tan (α - β), cos 2α, and sin β/2 under the given conditions:

cos α =√5/5, 0<α<π/2; sin β = -4/5, - π/2<β<0

Reference no: EM131017092

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