Ask a New Question
Search
If A + B + C = 180°, Prove that
Cos²A + Cos²B - Cos²C = 1 – 2sinAsinBcosC
1 answer
I've got the same problem! please help
Ask a New Question
or
answer this question
.
Similar Questions
If A + B + C = 180° prove that
cos2A + cos2B – cos2C = -1 -4cosAcosBcosC
0 answers
If A + B + C = 180°, Prove that
Cos²A + Cos²B + Cos²C = 1-2cosAcosBcosC
2 answers
how do you solve this.prove: cos2A plus cosA divided by sin2A minus sinA equal to cos2A plus 1 divided by sinA
1 answer
Prove the identities
1. cos3Ɵ + cos Ɵ = 4cos^Ɵ - 2 cos Ɵ 2. sin (A+B)sin (A-B)=cos2B + sin^2 A-1
1 answer
more similar questions