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Evaluate the Following : Sin21∘/Cos69 - CBSE Class 10 - Mathematics

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Question

Evaluate the following :

`(sin 21^@)/(cos 69^@)`

Solution

Given that `(sin 21^@)/(cos 69^@)`

Since `sin (90 - theta) = cos theta`

`=> (sin 21)/(cos 69) = sin(90 - 69)/cos 69`

`=> sin 21/cos 69 = cos 69/cos 69`

`=> sin 21/cos 69 = 1`

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Solution Evaluate the Following : Sin21∘/Cos69 Concept: Trigonometric Ratios of Some Specific Angles.
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