Sunday, August 25, 2013

simplify: cot(arcsin(-2/3))

for convenience, we write 
theta=arcsin%28-2%2F3%29 
sin%28theta%29=-2%2F3 
so that means... 
y=-2, r=3, x=sqrt%285%29 
cot%28theta%29=x%2Fy=-sqrt%285%29%2F2
at

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