- How can you express (-1 + tanx) / (1 + tanx) as a function of x alone?

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Outside temperature over a day can be modelled as a sinusoidal function.? Multiply matrices A and B of any sizes legally (no size compatibility requirment). What kind of matrix multiplication am I? I'm trying to find a compound that contains an alkaline earth metal and a polytomic ion and then finding its molar mass.? Find integers x and y such that 57x+79y=17, and 400 How many moles of ions are in a solution of 7.4 moles FeCI3 in 500 mL water?