Question 862979
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Hi
y = x^2 cosx
Apply Product Rule: 
{{{dy/dx = x^2(-sin(x)) + cos(x)(2x)}}} = x(2cosx -xsinx)
Need to Know:
{{{(d(c))/dx  = 0 }}}  
{{{d(sin(x))/dx = cos(x)}}}
{{{d(cos(x))/dx = -sin(x)}}}  
{{{d(tan(x))/dx = sec^2(x)}}}  
{{{d(cot(x))/dx = -csc^2(x)}}}
{{{d(e^x)/dx = e^x }}}