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If (1+tan^(2)theta)=(625)/(49)andtheta ...

If `(1+tan^(2)theta)=(625)/(49)andtheta` is acute , then what is the value of `(sqrt(sintheta+costheta))` ?

A

1

B

`(5)/(4)sqrt((31)/(42))`

C

`(sqrt(31))/(5)`

D

`(5)/(7)`

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The correct Answer is:
C
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KIRAN PUBLICATION-TRIGONOMETRY -TYPE - II
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