I most humbly beseech help for this question.
If $A+B+C=180$ degrees, then prove $$ \sin^2(A)+\sin^2(B)-\sin^2(C)=2\sin(A)\sin(B) \cos(C) $$ I am not sure what trig identity I should use to begin this problem.
I most humbly beseech help for this question.
If $A+B+C=180$ degrees, then prove $$ \sin^2(A)+\sin^2(B)-\sin^2(C)=2\sin(A)\sin(B) \cos(C) $$ I am not sure what trig identity I should use to begin this problem.