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2\ s in1^0 15 ' is equal to- a.\ sqrt(2-...

`2\ s in1^0 15 '` is equal to- a.`\ sqrt(2-sqrt(2+sqrt(2)))` b. `\ sqrt(2-sqrt(2-sqrt(2)))` c.`sqrt((2+2sqrt(-sqrt(2)))/2)` d. `sqrt((2+sqrt(2+sqrt(2)))/2)`

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