Fernando Martinez
Reputation
Top tag
Next privilege 50 Rep.
Comment everywhere
Badges
1 2
Newest
Impact
~3k people reached

• 0 posts edited
• 0 helpful flags
• 0 votes cast

# 10 Actions

 Sep11 awarded Notable Question May13 awarded Popular Question Aug1 comment Prove $\sin^2(A)+\sin^2(B)-\sin^2(C)=2\sin(A)\sin(B) \cos(C)$ if $A+B+C=180$ degrees Fernando Martinez appreciates all the post and the work that went into answering his question. Jul31 comment Prove $\sin^2(A)+\sin^2(B)-\sin^2(C)=2\sin(A)\sin(B) \cos(C)$ if $A+B+C=180$ degrees What would I do next I am not sure what to do..... Jul31 comment Prove $\sin^2(A)+\sin^2(B)-\sin^2(C)=2\sin(A)\sin(B) \cos(C)$ if $A+B+C=180$ degrees I see my now so technically would I have now sin^2B-sin^2C=cos(a-b+c)-cos(a+b-c)=cos2c-cos2b=2sin^2B-2sin^2C Jul31 awarded Student Jul31 comment Prove $\sin^2(A)+\sin^2(B)-\sin^2(C)=2\sin(A)\sin(B) \cos(C)$ if $A+B+C=180$ degrees Hmm which two would I cancel out. Jul31 comment Prove $\sin^2(A)+\sin^2(B)-\sin^2(C)=2\sin(A)\sin(B) \cos(C)$ if $A+B+C=180$ degrees Sasha would I start on the right or left side sorry if its a dumb question.... Jul31 comment Prove $\sin^2(A)+\sin^2(B)-\sin^2(C)=2\sin(A)\sin(B) \cos(C)$ if $A+B+C=180$ degrees thanks for your post I will study them and use them to solve the problem. Jul31 asked Prove $\sin^2(A)+\sin^2(B)-\sin^2(C)=2\sin(A)\sin(B) \cos(C)$ if $A+B+C=180$ degrees