Math, asked by jeffrinveroni, 7 months ago

find the value of Cos A + Cos(120+A) + Cos(120-A)

Answers

Answered by sandy1816

2

Answer:

CosA+cos(120+A)+cos(120-A)

=CosA+2cos120cosA

[cos(A+B)+cos(A-B)=2cosAcosB]

=cosA+2cos(180-60)cosA

=CosA-2cos60cosA

=cosA-2(1/2)cosA

=cosA-cosA

=0

Previous Question

Next Question

Similar questions

CBSE BOARD X, 3 months ago

Helmuth 's father wad a and supporter of...

India Languages, 3 months ago

No Indian meal is complete without a mouth-watering dessert. To which states do these swee belong? Match the columns. SWEETS STATES 1. shrikhand a. west bengal 2. mysore pak b. punjab 3. misthi doi c. Rajasthan 4.gajar ka halwa d. Karnataka 5. ghevar e. Gujarat...

English, 3 months ago

Change in the sentence in the the compartitive degree. No other boy in the class is as tail as Raju ...

Math, 7 months ago

The ratio of two men to age is 5:7, 18 years ago his age was in the ratio of 8:13 his age is.

Hindi, 7 months ago

उत्तरे लिया करणारगड कुठे बसलेल्या आहे...

Physics, 11 months ago

1. An object has moved through a distance. Can it have zero displacement? If yes, support your answer with an example.

English, 11 months ago

kab tak aayenge in inglish...

Math, 11 months ago

which of two speed is Greater 20 metre per second or 90 kilometre per hour...