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If alpha and beta are the …

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If alpha and beta are the solutions of a cos x + b sin x = c then show that I) cos ( alpha + beta ) = a^2 - b^2 ÷ a^2 + b^2 2) cos ( alpha - beta ) = 2c^2 - (a^2 + b^2 ) ÷ a^2 + b^2

    • Posted by Yogita Gaur 6 years, 3 months ago

    CBSE > Class 11 > Mathematics
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