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If acos2theta+b sin2theta=c has alpha an...

If `acos2theta+b sin2theta=c` has `alpha` and `beta` as its solution, then the value of `tanalpha+tanbeta` is

A

`(c+a)/(2b)`

B

`(2b)/(c+a)`

C

`(c-a)/(2b)`

D

`(b)/(c+a)`

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