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Rajan@2021
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Express the following in terms of T-ratios of angles lying between 0° and 45°: cosec54° + sin72°

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This question is from trigonometry topic -trigonometric ratios on complementary angles in which we have to Express the following in terms of T-ratios of angles lying between 0° and 45°: cosec54° + sin72°

RS Aggarwal, Class 10, chapter 12, question no 8(iv)

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1 Answer

  1. We have,
    cosec(9θ)=secθ  and  sin(9θ)=cosθ

    csc5=csc(93)=sec3
    sin7=sin(91)=cos1

    csc5+sin7=sec3+cos1

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