Math, asked by poojitah4054, 2 months ago

4cos105°×cos15°=0 prove that.

Answers

Answered by rkcomp31

0

Answer:

=-1

Step-by-step explanation:

4cos105°×cos15°=0

LHS=4cos105°×cos15°

=4cos(90+15)*cos15

=-4sin15cos15

=-2*2sin15cos 15

=-2*sin30

=-2*1/2

=-1

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