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1 + cos10^@ + cos 20^@ + cos 30^@ =...

`1 + cos10^@ + cos 20^@ + cos 30^@` =

A

`4cos5^@ cos10^@ cos15^@`

B

`4cos10^@ cos20^@ cos30^@`

C

`4sin5^@ sin10^@ sin15^@`

D

`4sin10^@ sin20^@ sin30^@`

Text Solution

Verified by Experts

The correct Answer is:
A
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