Home
Class 11
MATHS
cos 1^(@) + cos 2^(@) + cos 3^(@) + ….+ ...

cos `1^(@) + cos 2^(@) + cos 3^(@) + ….+ cos 179^(@)` =

A

0

B

1

C

`-1`

D

89

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • SURAS MODEL QUESTION PAPER -2

    SURA PUBLICATION|Exercise Section - II|10 Videos
  • SURAS MODEL QUESTION PAPER -2

    SURA PUBLICATION|Exercise section - III|10 Videos
  • SURAs MODEL QUESTION PAPER - 1

    SURA PUBLICATION|Exercise PART-IV|11 Videos
  • TRIGONOMETRY

    SURA PUBLICATION|Exercise SECTION - D|5 Videos

Similar Questions

Explore conceptually related problems

cos 1^@ + cos 2^@ + cos 3^@ + cos 4^@ + ……….. Cos 179^@ = …………………….. .

cos1^(@)+cos2^(@)cos3^(@)...+cos179^(@)" is "

Prove that cos (30^(@) -A ) cos (30^(@) + A ) + cos (45^(@) - A) cos (45^(@) + A) = cos 2A + (1)/(4) .

cos 6x = 32 cos ^(6) x - 48 cos ^(4) x + 18 cos ^(2) x-1

Prove that cos 20^(@) cos 40^(@) cos 80^(@)=1/8

Prove that cos A cos 2A cos 2^(2) A cos 2^(3)A....cos 2^(n-1) A=(sin 2^(n) A)/(2^(n) sin A)

Prove that cos 24^(@)+cos 55^(@)+cos 125^(@)+cos 204^(@)+cos 300^(@)=1/2

Show that cos^(2) A + cos^(2)B - 2 cos A cos B cos (A + B) = sin^(2) (A + B)