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If 2sin3 theta =1, then value of theta ...

If `2sin3 theta =1`, then value of `theta ` is:
यदि `2sin3 theta =1` है, तो `theta ` का मान क्या होगा ?

A

a)`10^@`

B

b)`45^@`

C

c)`20^@`

D

d)`30^@`

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