Calculation: log6 base 3 = a, log6 base 5 = B, expressed by a, B: log15 base 36, need a complete process

Calculation: log6 base 3 = a, log6 base 5 = B, expressed by a, B: log15 base 36, need a complete process

log6(3)=a
log6(5)=b
log36(15)=log36(3)+log36(5)
=log6(3)/2+log6(5)/2
=(a+b)/2