Q 2512323239.     If `P, Q` and `R` are angles of an isosceles triangle and ` angleP = pi/2` then the value of `(cos(p/3)-i sin(p/3))^3+(cosQ+isinQ)`

`(cosR-isinR)+(cosP-isinP)`
`(cosQ-isinQ)(cosR-isinR)` is

WBJEE 2013
A

`i`

B

`-i`

C

`1`

D

`-1`

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