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If costhetaltsinthetaandtheta lies in ...

If `costhetaltsinthetaandtheta` lies in the first quadrant , then which one of the following is correct ?

A

`0ltthetaltpi//4`

B

`pi//4ltthetaltpi//2`

C

`0ltthetaltpi//3`

D

`pi//3ltthetaltpi//2`

Text Solution

Verified by Experts

The correct Answer is:
B
We know that , for `(pi)/(4)ltthetalt(pi)/(2)`
`costhetaltsin theta`
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NDA PREVIOUS YEARS-TRIGONOMETRY - RATIO & IDENTITY , TRIGONOMETRIC EQUATIONS-MCQ
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