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Rajan@2021
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Without using trigonometric tables, prove that sin²48° + sin²42° = 1

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This is the basic and conceptual question from trigonometric ratios on complementary angles in which we have to show that

sin²48° + sin²42° = 1 without using trigonometric tables

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

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1 Answer

  1. LHS

    =sin²48°+sin²42°

    =sin²48°+sin²(9048

    =sin²48°+cos²48°

    =1=RHS

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