Trigonometric Limits
Trigonometric Limits
more examples of limits
Substitution Theorem for
Trigonometric Functions
laws for evaluating limits
Theorem A. For each point c in function¡¯s
domain:
lim sin x = sin c,
x¡úc
lim tan x = tan c,
x¡úc
lim csc x = csc c,
x¡úc
lim cos x = cos c,
x¡úc
lim cot x = cot c,
x¡úc
lim sec x = sec c.
x¡úc
Theorem A. For each point c in function¡¯s
domain:
lim sin x = sin c,
x¡úc
lim tan x = tan c,
x¡úc
lim csc x = csc c,
x¡úc
lim cos x = cos c,
x¡úc
lim cot x = cot c,
x¡úc
lim sec x = sec c.
x¡úc
Proof. Prove first that
lim sin x = 0,
x¡ú0
lim cos x = 1.
x¡ú0
Is it obvious?
lim sin x = 0,
x¡ú0
y=sin(x)
lim cos x = 1.
x¡ú0
y=cos(x)
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