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Rajan@2021
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Without using trigonometric tables, prove that cosec^2 72° – tan^2 18° = 1

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This is the basic and conceptual question from trigonometric ratios in which we have to prove that cosec^2 72° – tan^2 18° = 1 without using trigonometric tables.

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

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1 Answer

  1. LHS=cosec²72°tan²18°

    =cosec²72tan²(9072

    =cosec²72°cot²72°

    =1=RHS

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