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cos[pi/6+cos^-1(-1/2)]નું મૂલ્ય છે....

`cos[pi/6+cos^-1(-1/2)]`નું મૂલ્ય ____છે.

A

`-sqrt3/2`

B

`(sqrt3-1)/(2sqrt2)`

C

`(sqrt5-1)/4`

D

`(sqrt3+1)/(2sqrt2)`

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