## If m 2 + m ′ 2 + 2 m m ′ cos θ = 1, n 2 + n ′ 2 + 2 n n ′ cos θ = 1 , and (m n ′ + m ′ n) = cos θ = θ , then prove that m 2 + n 2 = cosec θ.

Question

If m 2 + m ′ 2 + 2 m m ′ cos θ = 1, n 2 + n ′ 2 + 2 n n ′ cos θ = 1 , and (m n ′ + m ′ n) = cos θ = θ , then prove that m 2 + n 2 = cosec θ.

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1 week 2021-10-04T23:56:15+00:00 1 Answer 0 views 0