If a, b, c are the sides of a triangle and A, B, C are the opposite angles, find ∂A/∂a, ∂A/∂b, ∂A/∂c by implicit differentiation of the Law of Cosines.

c.the charges if the proton and electron and gravity

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answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.