Two people are pushing a piano. One person pushes it with 175 pounds at an angle of 60 degrees To the x axis while the other pushes it with 250 pound at an angle of 30 degrees To the x axis. In what...

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given that f(x) = sin(x), show that f(x+h)-f(x)/h = sinx(cos(h)-1/h) + cos(x)(sin(h)/h) precal question