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If cos(theta+phi)=mcos(theta-phi) ,then ...

If `cos(theta+phi)=mcos(theta-phi)` ,then `tantheta ` is equal to a.`((1+m)/(1-m))t a n\ varphi` b. `((1-m)/(1+m))t a n\ varphi` c.`((1-m)/(1+m))cot\ varphi` d. `((1+m)/(1-m))cot\ varphi`

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