I am trying to integrate -tan(x)sec^2(x) and getting -tan^2(x) / 2. When I put it in wolfram alpha it gets the same answer when I press show solution, but without pressing it it shows -sec(x)/2.(adsbygoogle = window.adsbygoogle || []).push({});

So I am wondering, is it the case tan^2(x) = sec(x)?? I don't remember this as a correct trig identity

http://www.wolframalpha.com/input/?i=-tan%28x%29sec^2%28x%29+integral

Notice the difference in answer when you press for the show step by step solution

**Physics Forums - The Fusion of Science and Community**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Trig identity that I'm missing

Loading...

Similar Threads - Trig identity missing | Date |
---|---|

I Infinite series of trigonometric terms | Sep 30, 2017 |

I Sum-difference trig identity help | Jan 10, 2017 |

B Factoring quadratic equation (with trig identities used) | Sep 26, 2016 |

B Are there multiple ways to verify a trig identity? | May 1, 2016 |

I need help badly with general answers to trig equations. (Using identities) | Feb 24, 2015 |

**Physics Forums - The Fusion of Science and Community**