Note:- 1) If y = cosx ; then dy/dx = -sinx
2) If y = u/v ; where 'u' & 'v' are functions of x or constants ; then dy/dx = [vu'-uv']/(v^2)
`f(t) = cost/t`
`f'(t) = [-t*sint - cost]/t^2`
`or, f'(t) = -[t*sint-cost]/t^2`
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