- Prove the identity (1+tan^2x)/(cosec^2x)=tan^2x?

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What triggered Copernicus idea for the Heliocentric system. How did he come to this idea, what pushed him to go for it.? How many moles and molecules are in 500mg of a vitamin tablet? How does a cometâ€™s appearance change as it approaches the sun? Why does this occur? Y+5=-2x Without drawing a graph find the intercepts of each line. Put anwers inorderd pairs? To find the derivative of f(x)=(1/15)(4x^(3)-69x^(2)+252x) do I use the product rule? If not how do i differentiate?