- (dr/dtheta)=pi cos pi theta, r(2)=2 how do you solve for theta? NEED HELP PLSS?

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The angle of elevation of the sun is 28 degrees 10 minutes,the shadow of a tree on horizontal ground is 97.3 ft. long. How tall is the tree? If a processed burger was cooled to 1 degree Kelvin how long would it take to thaw? What is the equation for the parabola with focus (-2,0) and diretrix x=2? 2H2(g) + O2(g) = 2H2O(g) ΔH = -484 kJ How much energy is released from the combustion of 2.00g of hydrogen? Include the correct sign (+/-)? What would happen if I drink a Litre of Lead or Gold?

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