Hello, I have been trying to solve this type of question but the results of my efforts are frequently disappointing. Since this is considered elementary and simple I have no doubt that someone can help me with this:(adsbygoogle = window.adsbygoogle || []).push({});

Solve arcsin (3/5) + arctan (1/7).

What if it had said 641/19 instead of 3/5, and 3/711 instead of 1/7? My teachers guided me towards:

tan x = tan (arcsin 3/5 + arctan 1/7) =, if arcsin 3/5 = A and arctan 1/7 = B, =

sin(A + B)/cos(A + B) which I develop to [(sinAcosB + cosAsinB)/(cosAcosB + sinAsinB)].

I do not know what to do next, and I certainly do not see how this is elementary - or am I trying to solve it the wrong way? I know the answer but the method eludes me.

I apologize if above looks messy; some posts I have read contains very structured mathematical language and it seems to be in a different font - larger and bolder, but I don't know how to write that.

Thanks in advance.

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

Join Physics Forums Today!

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

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

# Elementary Trigonometry, Help with

Loading...

Similar Threads - Elementary Trigonometry Help | Date |
---|---|

B What does cosx/x and tanx/x represent? | Sep 23, 2015 |

Integrals/Non-Elementary Antiderivatives | Mar 26, 2014 |

Proof that sinc function is not elementary? | Dec 7, 2013 |

Elementary Function with Non-elementary Derivative | Mar 19, 2013 |

Proof of an elementary but very important result | Dec 14, 2011 |

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