Update ANS: If θ1, θ2, θ3, ..., θn are in A.P., whose common difference is d, show that secθ1 secθ2 + secθ2 secθ3 + ... + secθn–1 secθn = (tanθn-tanθ1)/sin d

30 Sept 2021

If θ1, θ2, θ3, ..., θn are in A.P., whose common difference is d, show that secθ1 secθ2 + secθ2 secθ3 + ... + secθn–1 secθn = (tanθn-tanθ1)/sin d

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