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If Sec4 theta= Cosec (theta + 20^@) , th...

If `Sec4 theta= Cosec (theta + 20^@)` , then `theta` is equal to:
यदि `Sec4 theta= Cosec (theta + 20^@)` है, तो `theta` किसके बराबर है?

A

a)`22^@`

B

b)`18^@`

C

c)`14^@`

D

d)`20^@`

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