If the point starts at and rotates counterclockwise, which statement is TRUE? a. x=cosθ andy=sinθ and both functions have a period ofπ . b. x=sinθ andy=cosθ and both functions have a period of 2π . c. x=sinθ andy=cosθ and both functions have a period ofπ . d. x=sinθ andy=cosθ and both functions have a period of 2π .