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- Show that cos21θ=cos^3(7θ)−3cos7θsin^2(7θ )and use this identity to find an equation in rectangular coordinates for the curve r=3cos21θ =(x^2+y^2)^2Draw a diagram to show that there are two tangent lines to the parabola y=x^2 that pass through the point (0, -5). Find the coordinates where these tangent lines meet the parabola.Find an equation in rectangular coordinates for the curve r^2 = cos 2θ.