What is the taylor series expansion for the tangent function (tanx)?

Answer 1

# tan x = x + 1/3x^3 +2/15x^5 + ...#

The Maclaurin series is given by

# f(x) = f(0) + (f'(0))/(1!)x + (f''(0))/(2!)x^2 + (f'''(0))/(3!)x^3 + ... (f^((n))(0))/(n!)x^n + ...#

We start with the function

# f^((0))(x) = f(x) = tanx #

Then, we compute the first few derivatives:

# \ \ \ \ \ \ \ \ \ \ \ \ = sec^2(x) #
# f^((2))(x) = (2 sec^2x)(secx tanx)() # # \ \ \ \ \ \ \ \ \ \ \ \ = 2 sec^2x tanx # # \ \ \ \ \ \ \ \ \ \ \ \ = 2 (1+tan^2x) tanx # # \ \ \ \ \ \ \ \ \ \ \ \ = 2 (tanx+tan^3x) #
# f^((3))(x) = 2{sec^2x+3tan^2x sec^2x} # # \ \ \ \ \ \ \ \ \ \ \ \ = 2sec^2x{1+3tan^2x} # # \ \ \ \ \ \ \ \ \ \ \ \ = 2sec^2x{1+3(sec^2x-1)} # # \ \ \ \ \ \ \ \ \ \ \ \ = 2sec^2x{1+3sec^2x-3} # # \ \ \ \ \ \ \ \ \ \ \ \ = 6sec^4x-4sec^2x #
# vdots #
Now we have the derivatives, we can compute their values when #x=0#
# f^((0))(x) = 0 # # f^((1))(x) = 1 # # f^((2))(x) = 0 # # f^((3))(x) = 2 # # vdots #

Which permits us to form the Maclaurin serie:

# f(x) = (0) + (1)/(1)x + (0)/(2)x^2 + (2)/(6)x^3 + ... (f^((n))(0))/(n!)x^n + ...#
# \ \ \ \ \ \ \ = x + 1/3x^3 + 2/15^5x^5 + ... #
Sign up to view the whole answer

By signing up, you agree to our Terms of Service and Privacy Policy

Sign up with email
Answer 2

The Taylor series expansion for the tangent function (tanx) centered around x = 0 is:

tan(x) = x + (x^3)/3 + (2x^5)/15 + (17x^7)/315 + ... + ((2^(2n) * (2^(2n) - 1) * B_{2n} * x^(2n-1))/(2n)!) + ...

where B_{2n} are the Bernoulli numbers and n! denotes the factorial of n.

Sign up to view the whole answer

By signing up, you agree to our Terms of Service and Privacy Policy

Sign up with email
Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

Not the question you need?

Drag image here or click to upload

Or press Ctrl + V to paste
Answer Background
HIX Tutor
Solve ANY homework problem with a smart AI
  • 98% accuracy study help
  • Covers math, physics, chemistry, biology, and more
  • Step-by-step, in-depth guides
  • Readily available 24/7