Find : cos(A)+sin(270+A)-sin(270-A)+cos(180+A) *Can someone point out mistake in my answer?? (Ans is given as 0)* Cos(A) is simply cos(A) Sin(270+A)=-cos(A) -Sin(270-A)= -[-cos(A)]=cos(A) Cos(180+A)=cos(A) We we add them, we get 2cos(A)
Answers
Answered by
1
Step-by-step explanation:
cos (180 + A) = - cos A
since 180+A lies in 3rd quadrant where only tan and cot are positive
with this correction, you will get the correct answer
Similar questions