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Question
Evaluate the following:
`(sin 21^@)/(cos 69^@)`
Evaluate
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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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Chapter 10: Trigonometric Ratios - EXERCISE 10.3 [Page 10.36]
