to prove ,cosAcos(C-A)-sinAsin(C-A)=cosC
himanshu369:
thanks for solving my problem
Answers
Answered by
3
Since
Cos(x+y)=cosxcosy-sinxsiny
Therefore
cosAcos(C-A)-sinAsin(C-A) =cos(A+C-A) =cosC
RHS=cosC
since
LHS=RHS
Thus proved
Cos(x+y)=cosxcosy-sinxsiny
Therefore
cosAcos(C-A)-sinAsin(C-A) =cos(A+C-A) =cosC
RHS=cosC
since
LHS=RHS
Thus proved
bhai ye cos(A+C-A) khah se aya
bhai ye identity hot h
hoti*
cos(x+y)=cosxcosy-sinxsiny
in the question x is A and y is C-A
main puch raha hu cos(A+C-A) kaha se aya
Similar questions