1. cos(arccos(u) + arccos(v)) First, we should think of arccos(u) and arccos(v) as angles. Make up some names for them. Set a = arccos(u) and 3 = arccos(v). Use what you know about compositions of trig function and inverse trig functions to compute the following: cos(a) = cos(arccos(u)) cos(3)= cos(arccos(v)) sin(a) = sin(arccos(u)) • sin(3) = sin(arccos(v)) Now that we know cos(a), cos(3), sin(a) and sin(3), we can use angle addition formulas to compute cos(arccos(u) + arccos(v)) = cos(a + 3) = = In your final answer and should be the independent variables

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