Question 862767
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Hi
y = sinx cosx  
Apply Product Rule
{{{dy/dx = sin(x)(-sin(x)) + cos(x)*cos(x) = cos^2(x)-sin^2(x)}}}  
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)}}}