- Lim as x->pi/4 (sec^2x-2tgx)/(1+cos4x)?

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How to solve problems below? Does changing the frequency or wavelength of a wave affect how much energy it has? Explain.? How many moral mushrooms makes a pound? One drop of vitamin D3 is it tiny drop or one squeeze of the dropper? Describe the process in proving that the solution of an inequality is valid.?