Question

Triangle Abc, if a,b,c are in ap then cos(a-c/2)cosec(B/2)

Answer 1

Since they r in ap,

A=b-d

B=b

C=b+d

By adding

3b=180

b=60

By substituting a and c values in the to find we get cos(-2d)

Therefore a>c

Therefore a=b+d

c=b-d

Therefore the eq. Comes down to

(√2)cos (d)

Here d can be substituted any value

We will get 59 solutions for this