1. The problem statement, all variables and given/known data Consider the two space curves r1(t) = <cos(t − 1), t^2 − 1, 2t^4> r2(s) = <1 + ln s, s^2 − 2s + 1, 2s^2>, where t and s are two independent real parameters. Find the cosine of the angle between the tangent vectors of the two curves at the intersection point (1, 0, 2). Please show me steps..thank you! 2. Relevant equations 3. The attempt at a solution I set cos(t-1)=1 and got t=1. In the same manner, I got s=1. But I'm not sure how to get r'(1)....I'd appreciate any help on this!