Home
Class 11
MATHS
If A+B+C=(3pi)/(2), prove that cos 2A+ c...

If `A+B+C=(3pi)/(2),` prove that `cos 2A+ cos 2B+ cos 2C=1-4 sin A sin B sin C `.

Promotional Banner

Topper's Solved these Questions

  • FINAL TOUCH (A SPECIAL PACKAGE OF THE MOST IMPORTANT QUESTIONS TO SUCCEED IN EXAMINATION EASILY)

    VGS PUBLICATION-BRILLIANT|Exercise Trigonometric Equations (Very Short Answer Type Questions)|8 Videos

  • FINAL TOUCH (A SPECIAL PACKAGE OF THE MOST IMPORTANT QUESTIONS TO SUCCEED IN EXAMINATION EASILY)

    VGS PUBLICATION-BRILLIANT|Exercise Inverse Trigonometric Functions (Short Answer Type Questions)|9 Videos

  • FINAL TOUCH (A SPECIAL PACKAGE OF THE MOST IMPORTANT QUESTIONS TO SUCCEED IN EXAMINATION EASILY)

    VGS PUBLICATION-BRILLIANT|Exercise Trigonometric Ratios Upto Transformations (Short Answer Type Questions)|10 Videos

  • MATHEMATICS -I(A) MODEL PAPER 4

    VGS PUBLICATION-BRILLIANT|Exercise Section-C|7 Videos

Similar Questions

Explore conceptually related problems

If A+B+C=(pi)/(2) , then prove that cos 2A + cos 2B + cos 2C=1+4 sin A sin B sin C .

If A+B+C=(3pi)/(2) , prove that cos ^(2)A+ cos ^(2) B- cos ^(2)C=-2 cos A cos B sin C.

If A, B, C are angles of a triangle , prove that cos 2A - cos 2B + cos 2C =1 -4 sin A cos B sin C

If A+B+C=0 , then prove that sin 2A + sin 2B+ sin 2C=-4sin A sin B sin C .

If A, B, C are angles of a triangle , prove that cos 2A+cos 2B -cos 2C=1-4 sin A sin B cos C

If A+B+C=90^(@) " then " ( cos 2A + cos 2 B+ cos 2C-1)/( sin A sin B sin C )=

If A+B+C=180^(@) then prove that cos^(2)A+cos^(2)B-cos^(2)C=1-2sin A sin B cos C