@tomleslie 

need plot as T vs k[1]^2/K^2

@tomleslie 

T=4*k[1]^2*K^2/(4*k[1]^2*K^2+(k[1]^2+K^2)^2*sinh(KL)^2)

this is the actual expression

@tomleslie First of all thanks. I am too getting a straight line only. I am new to maple and at the starting stage of learning. Can you please suggest any easy manual to learn maple quickly and efficiently?

@tomleslie even if i put '*' in my expression there is no significant response in the evaluation.