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(cos(x+3.14/2))'The calculation above is a derivative of the function f (x)
-sin(x+3.14/2)*(x+3.14/2)'
-sin(x+3.14/2)*((x)'+(3.14/2)')
((3.14/2)'+1)*(-sin(x+3.14/2))
1*(-sin(x+3.14/2))
-sin(x+1.57)
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