cos20^(@) cos70^(@)-sin20^(@) sin70^(@) ...

`cos20^(@) cos70^(@)-sin20^(@) sin70^(@)` का मान है -

A

0

B

1

C

`oo`

D

`cos50^(@)`

लिखित उत्तर

Verified by Experts

The correct Answer is:

A

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