The Total solution for NCERT class 6-12
If cos-1 (x/2) + cos-1 (y/3) = α, thenprove that 9x2 – 12xy cos α + 4y2 = 36 sin2 α
Answer 1 :
Given cos-1 (x/2)+ cos-1 (y/3) = α
Hence, proved.
Answer 2 :
Given cos-1 (a/x)– cos-1 (b/x) = cos-1 (1/b) – cos-1 (1/a)
Solve :
Answer 3 :
Prove that:
Answer 4 :