Given that a belongs to (Wu / 2,3 Wu / 2), Tan (A-7 Wu) = - 3 / 4, then the value of sina + cosa is equal to?

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• 13. If Sina = 5, then cosa + sina is cosa Sina + cosa sina is cosa + Sina=
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• 15. Given Tan α + cot α = 52, α ∈ (π 4, π 2), then Cos2 α = 1___ ．
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• 17. Sin θ / radical (1-sin & sup2; θ) + radical (1-cos & sup2; θ) / cos θ Theta belongs to (3 π / 2,2 π)
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