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If θ1, θ2, θ3........,θn are in A.P., whose common difference is d, then,sec θ1 sec θ2+sec θ2 sec θ3+..........+sec θn−1 sec θn=

Answer»

If θ1, θ2, θ3........,θn are in A.P., whose common difference is d, then,

sec θ1 sec θ2+sec θ2 sec θ3+..........+sec θn1 sec θn=



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