Differentiate w.r.t x by using first principle i)xcosx Share with your friends Share 9 Manish Bharti answered this 54 View Full Answer Kadiyala Aaryani answered this f(x) = cosxf(x+h) = cos(x+h)f(x)= y1 = lim h-------->0 f(x+h) - f(x)/h substitute in that and solve it u will get the answer -8 Maria Shaikh answered this what should i substitute?..i dont understand your concept of solvin this! 0