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pythagorean identity (sin & cos)
sin²(x) + cos²(x) = 1
pythagorean identity (tan & sec)
1 + tan²(x) = sec²(x)
pythagorean identity (cot & csc)
1 + cot²(x) = csc²(x)
3 Conditions for Continuity
1) f(a) exists
2) lim[x→a] f(x) exists
3) lim[x→a] f(x) = f(a)
limx→0 sin(x)/x
1
limx→0 x/sin(x) = 1
1
limx→0 (1 - cos(x))/x
0
limx→0 (cos(x)-1)/x
0
limx→0 tan(x)/x
1