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What is the value of cosec(65^@+theta) -...

What is the value of `cosec(65^@+theta) -sec(25^@-theta)+tan^2 20^@- cosec^2 70^@` ?
`cosec(65^@+theta) -sec(25^@-theta)+tan^2 20^@- cosec^2 70^@` का मान क्या है ?

A

2

B

`-1`

C

1

D

0

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