shm

d/dx sin  (x) =  cos (x) d/dx cos (x) =  - sin (x)d/dx tan (x) =   dy/dx [sin (x)/cos (x) ]                 =    cos(x) cos(x)-sin(x)[sin(x)]                      ---------------------------------------                                   cos^2(x)                 =   1/cos^2(x)                 =    sec^2(x)

an object move in a circular motion with a radius of r & constant angular velocity w at t =0, the object situated at x    after a certain period, the object is situated at P and @ =wt

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