英文微积分1.an equcation of the lone tangent to the graph of y=cos(2x) at x= π/4 isA.y-1= -(x-π/4)B,y-1= -2(x-π/4)C.y=2(x-π/4)D.y= -(x-π/4)E.y= -2(x=π/4)2.d/dx cos^2(x^3)=3.0.5∫e^0.5 dt=4.the graph of y=3x^4-16x^3+24x^2+48 is concave dow

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