True or False: [5 Marks] 11. The derivative of a sinusoidal function is another sinusoidal function. 12. The rate of change of a sinusoidal function is periodic in nature. 13. A sinusoidal function can be differentiated only if the independent variable is measured in radians. 14. The derivatives of the reciprocal trigonometric functions can be found using the chain rule and their related base functions. 15. There are an innite number of tangents with a given non-zero slope to a sinusoidal curve