1.

Prove that (cos^2 48° -sin^2 12°=(√5+1)/8​

Answer»

Step-by-step EXPLANATION:

cos^A- SIN^2B=cos(A+B)sin(A-B)

=cos60sin36

(1÷2)((√5+1)÷4)

=(√5+1)/8



Discussion

No Comment Found

Related InterviewSolutions