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Rajan@2021
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Without using trigonometric tables, prove that cos²57° – sin²33° = 0

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This is the basic and conceptual question from trigonometric ratios on complementary angles in which we have to show that cos²57° – sin²33° = 0 without using trigonometric tables

RS Aggarwal, Class 10, chapter 12, question no 2(viii).

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  1. LHS=cos²57°sin²33°

    =cos²57°sin²(9057

    =cos²57°cos²57°

    =0=RHS

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