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Find the laplace transformation of cos ² wt

There is a tiger ,deer, and fox in one forest ,deer and tiger are best friends ,one day deer was accidentally it loses her leg,so that deer is placed under a tree and tiger is giving food every day ,by seeing all this fox is thinking like this if i lost my leg I am also happily can eat good food without any problems 

Here 

Fox think like that , if you are the fox at that time what is your answer?  Will you think like that?

solve the following equations in series: dashes denote differentiation wrt x 1.(d^(2)y)/(dx^(2))-y=0

Which of the following pairs of species would generate a salt derived from a weak acid and a weak base?

HCl and NaOH

HF and CH3NH2

H2S and Ca(OH)2

HNO3 and KF