1.

4 cos36^@+cot7(1^@)/2=

Answer»

`1+sqrt2+sqrt3+sqrt4+sqrt5+sqrt6`
`1+sqrt2-sqrt3+sqrt4-sqrt5+sqrt6`
`1-sqrt2+sqrt3-sqrt4+sqrt5-sqrt6`
`1+sqrt2-sqrt3+sqrt4+sqrt5-sqrt6`

ANSWER :A


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