If sintheta+sqrt(sintheta+sqrt(sintheta+...

If `sintheta+sqrt(sintheta+sqrt(sintheta+sqrt(sintheta+...+oo)))=sec^4alpha,` then `sintheta` is equal to- a.`sec^2alphatan^2\ alpha` b. `2((1-cos2alpha))/((1+cos2alpha))` c. `2((1+cos2alpha))/((1-cos2alpha))\ ` d. `cot^2alphacos e c^2alpha`

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