Use the given information to find the exact value of each of the following.   a.  sine 2 thetasin2θ                                         b.   cosine 2 thetacos2θ                                c.  tangent 2 thetatan2θ   sine theta equals seven fifteenths commasinθ=715, thetaθ lies in quadrant II       Question content area bottom Part 1 a.   sine 2 thetasin2θ ​= enter your response here   ​(Simplify your answer. Type an exact​ answer, using radicals as needed. Use integers or fractions for any numbers in the expression. Rationalize all​ denominators.) Part 2 b.   cosine 2 thetacos2θ ​= enter your response here   ​(Simplify your answer. Type an exact​ answer, using radicals as needed. Use integers or fractions for any numbers in the expression. Rationalize all​ denominators.) Part 3 c.   tangent 2 thetatan2θ ​= enter your response here   ​(Simplify your answer. Type an exact​ answer, using radicals as needed. Use integers or fractions for any numbers in the expression. Rationalize all​ denominators.)