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Solve the following/ निम्नलिखित को हल क...

Solve the following/ निम्नलिखित को हल कीजिए : `(sin 40^@)/(cos 50^@)+ (cosec 50^@)/(sec 40^@)-4 cos50^@ cosec40^@`

A

`-1`

B

`-2`

C

1

D

2

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