Home
Class 11
MATHS
" 2."cos(A+B)cos(A-B)=...

" 2."cos(A+B)cos(A-B)=

Promotional Banner

Similar Questions

Explore conceptually related problems

If 3tanA tanB=1 , then prove that 2cos(A+B)=cos(A-B)

If 3tan A tan B=1, prove that 2cos(A+B)=cos(A-B)

If 3t a n At a n B=1, prove that 2cos(A+B)=cos(A-B)dot

If 3t a n At a n B=1, prove that 2cos(A+B)=cos(A-B)dot

If 3tan A tan B=1, prove that 2cos(A+B)=cos(A-B)dot

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

Prove (i)cos(A+B)+cos(A-B)=2cos A cos B(ii)cos(A-B)-cos(A+B)=2sin A sin B

If sin2A+sin2B+sin2C+2cos(A-B)+2cos(A+B)=4 ,then Delta ABC is

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

If A+B+C=pi then prove cos( (A)/2) cos( (B-C)/2) + cos( B/2) cos((C-A)/2) + cos( C/2) cos( (A-B)/2) = sinA +sinB+sinC