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Rajan@2021
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Without using trigonometric tables, prove that cos^2 75° + cos^2 15° = 1.

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This is the basic and conceptual question from trigonometric ratios in which we have to prove that

cos^2 75° + cos^2 15° = 1, without using trigonometric tables

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

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