If costheta=1/2 , find the value of (...

If `costheta=1/2` , find the value of `(2sectheta)/(1+tan^2theta)`

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RD SHARMA ENGLISH-TRIGONOMETRIC IDENTITIES-All Questions

If sintheta=3/5 , find the values of other trigonometric ratios.
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If sintheta+costheta=sqrt(2)sin(90^@-theta) , determine cottheta .
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If tantheta=3/4 , find the value of (1-costheta)/(1+costheta)
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