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Finding partial derivative of a trig function

  • #1

Homework Statement



Find the partial derivative with respect to x of sin(xyz - 1)


Homework Equations



None needed.

The Attempt at a Solution



I took the answer to be yz*cos(xyz - 1), but wolfram alpha is giving me yz*cos(1 - xyz). Anyone know what's going on here? Thanks!
 

Answers and Replies

  • #2
19
0
cos(x) is equal to cos(-x)

Those answers are equivalent.

Btw, if you're confused as to what Wolfram Alpha is doing, press the "Show steps" button. Helps out sometimes.
 
  • #3
Ah right I see, thanks alot for clarifying that. I'm taking a senior level maths paper after 2 years of not doing maths, so I keep slipping up on things like that. Thanks again :)
 

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