13. Write the expression as a single trigonometric function. cos5x cosx - sin5x sinx Select the correct answer. a. cos2x b. cos8x C. cos6x d. cos9x e. cos7x 14. From the list below find the expression, identical for the given. 1-tant 1 + tan t Select the correct answer. 1- sin 2t a. Cost 1 - sin 2t b. Cos 2t 1 - cos 2t C. si n 2t 1 + sin 2t d. si nt 1 - sin t e. COst

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