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Which of the following identities are co...

Which of the following identities are correct?

A

(a) `(1+sintheta)/(costheta) +(costheta)/(1+sintheta)=2sectheta`

B

(b) `(1+cotA- " cosec "A)(1+tanA + secA)=2`

C

(c) `sqrt((1+sintheta)/(1-sintheta)) = |sectheta + tantheta|`

D

(d) `(costheta)/(1+sintheta) +(costheta)/(1-sintheta)=2sectheta`

Text Solution

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The correct Answer is:
A, B, C, D
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  14. If 0 lt alpha, beta lt pi and they satisfy cos alpha + cosbeta - cos(a...

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  17. If sintheta=K, -1<=K<=1 then number of values of theta for same value ...

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  18. If the sides of a right angled triangle are {cos 2 alpha + cos 2 bet...

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