How to i solve a ploynomial and trig function equation

Question:How to i solve a ploynomial and trig function equation

Posted: tosynero 5 Product: Maple

April 03 2012

c:=12+10x^4+7x^3-89x^2+65x+4sinx

how do i plot a graph of c,

calculate the roots and check the correctness of all found roots.

Thanks for your kind solutions in advance.

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