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If tan 4 theta=cot(40^@-2 theta), then t...

If `tan 4 theta=cot(40^@-2 theta)`, then `theta` is equal to:
यदि `tan 4 theta=cot(40^@-2 theta)` है, तो `theta` किसके बराबर है?

A

`20^@`

B

`25^@`

C

`30^@`

D

`35^@`

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