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Use the formula k(t) = | |r'(t) x r" (t) ll to find k(t). |lr'(t) 113 r(t) = esti+etj 72e10t K (t ) = (Gue18t + 1)2Your answer is partially correct. Find the curvature and the radius of curvature at the stated point. r(t) = 8 cos(t)i + 3 sin(t)j + 5tk; t = NOTE: Enter the exact, simplified answers. 3 K = 81 X 89 p =Find div F and curl F if F(x, y, z) = x'i - 4j + yzk. div F= 7xityk curl F=Find div F and curl F if F(x, y, z) - 9eryi - 7 cosyj + 9 sin z k. div F= curl F=