Math, asked by paveldeb, 11 months ago

cos a + cos(120° + a) + cos (120° - a) = 0
any shortcut method for Jee main

Answers

Answered by kanishka6277

1

Answer:

=cosa +2cosa.cos120°

=cosa +2cosa.cos(90°+30°)

=cosa +2cosa.(-sin30°)

=cosa -2 cosa .1/2

=cosa -cosa

=0

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