Mathematics, Vector Calculus, Learning Mathematics, Math.
sin(t)j + t/2 k ds/dt = √5/2 T = –2/√5sin(t)i + 2/√5cos(t)j + 1/√5 k dT/dt = –2/√5cos(t)i + –2/√5sin(t)j |dT/dt| = 2/√5 N = dT/dt / |dT/dt| = –cos(t)i + –sin(t)j dN/ds = dN/dt / ds/dt = 2/√5sin(t)i + –2/√5cos(t)j dB/ds = T x dN/ds = 2/5(cos(t)i + sin(t)j) τ =|dB/ds| = 2/5 ..which is as I expect —