- How does the intensity of insolation change with each season?

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How to fuccckc without fuccing? What is something perform the same functions as cytoplasm? Ddddhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh? I need help with these Chemistry questions? Given the value f'(x)=2 sin^4(2x)-3 sin^3(4x) over the open interval (0,0.7), at what value of x is the tangent line to f horizontal?