If c is the circle x+ y2 = 1, z = 0 and t is unit tangent vector then value oft dr f dr =, where f = xzi + vi t xk alona the cunve y = sin@ coc

If C is the circle x+ y2 = 1, z = 0 and t is unit tangent vector then value oft dr F dr =, where F = xzi + vi t xk alona the cunve y = sin@ coc