calchelp

Determine the slope of the tangent at the indicated value of x f(x) = (x) cos^2 x, pie/4

f ƒ′(c) = 0 then ƒ(x) must have a local extreme point at x = c.

Determine two perpendicular unit vectors to a = [3, 5, -4] and b = [-3, 1, -5],

A 90 N force is applied to a wrench 5 cm away from a bolt, at an angle of 65º from the handle of the wrench. What is the torque produced? Round to 1 decimal

hmm there seems to be a problem... sec=opp/hyp, while tan=opp/adj therefore, sec=x/3 AND tan=sqrt(x^2-9)/3 cannot happen. If so can you please explain this. It may be simple algebra from this point, but it's 3:45 too! Thanks