Math, asked by jitendra1985, 10 months ago

Value of (cos 20° + cos 100+ cos 140) = ?

Answers

Answered by madhav1455m

0

Step-by-step explanation:

Cos 20° + Cos 100° + Cos 140° = 0

Answered by krishnakumar813102

3

Step-by-step explanation:

Cos20+cos100=2cos(100+20)/2cos(100-20)/2

=2cos(60)cos(40)

=2*1/2*cos(40)

=cos(40)

cos20+cos100+cos140=cos40 + cos140

=2cos(40+140)/2cos(40-140)/2

=2cos90cos50

=2*0*cos50

=0

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