7. Let x be a positive number and let 0 be the angle defined by (a) Express A and B in terms of x. Do not use any trigonometric or inverse trigonometric functions in your e = cos -1(23•x). answers.) Use this information and the right triangle sketched below to answer parts (a), (b), and (c) to the right. A = and B= (b) Express the area A(x)of the triangle as a function x. Do not use any trigonometric or inverse trigonometric functions in your answers. 1 A(x) = Part (c): Express sin 20 in terms of x. Do not use any trigonometric or inverse trigonometric functions in your answers. sin 20 =

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