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Rajan@2021
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Asked: 2021-04-04T18:37:20+05:30 In:

In a ∆ABC, in which ∠C = 90°, ∠ABC = θ°, BC = 21 units, AB = 29 units. Show that (cos^2θ – sin^2 θ) = 41/841.

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This is the basic and conceptual question from trigonometric ratios in which we are to prove that (cos^2θ – sin^2 θ) = 41/841, if in a ∆ABC, in which ∠C = 90°, ∠ABC = θ°, BC = 21 units, AB = 29 units.

RS Aggarwal, Class 10, Chapter 10, question no 26.

class 10 cbsers aggarwaltrigonometric ratios
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    1. Guru
      In a ∆ABC, in which ∠C = 90°, ∠ABC = θ°, BC = 21 units, AB = 29 units. Show that (cos^2θ – sin^2 θ) = 41/841.

      Hope it helps you.

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