QUESTION 1 Use the trigonometric substitution to select the algebraic expression as a trigonometric function of #, where sin and cos . 2 - x = 2 sin a. 2 cos = 2; sin = 0; cos = 1 O b. 2 sin 2; sin = 0; cos = 1 c. 2 cos = 2; sin = 1; cos = 0 d. 4 sin = 2; sin = 0; cos = 1 e.4 cos = 2; sin = 0; cos = 1 -- 2 2 Then find QUESTION 4 Use the formula following forms. y = asin BO+bcos BO= a +b cos(BB-C), where C = arctan(a/b), a > 0 to find the trigonometric expression in the a+b cos(BB-C) 6 sin 20+4 cos 20 a.4 cos(26-0.9828) b.6 cos(28 0.9828) C213 cos(28+0.9828) d. 213 cos(20-0.9828) Oe. 6 cos(20+0.9828)