Inverse Trigonometry
`\color{brown}"Proof : "`
`cos(2cos^{-1}x)=2x^2-1`
put x= cos u
ie `cos^{-1}x=u`
then LHS=cos(2 u)=`2cos^2u-1=2x^2-1`
put x= cos u
ie `cos^{-1}x=u`
then LHS=cos(2 u)=`2cos^2u-1=2x^2-1`
Python code to create a dynamic 3X3 matrix
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