1) given that A is obstuse and that sinA=2/(sqaureroot of 5). find the value of cosA and tanA.(adsbygoogle = window.adsbygoogle || []).push({});

2)given that tanA=-5/12 and that tanA and cosA have opposite signs, find the values of sinA and of cosA.

CAN SOMEONE TEACH ME EXACTLY HOW TO DO THESE PROBLEMS WITHOUT USING TRGNOMETRIC IDENTITES.PLEASE....I AM NEW TO THIS TOPIC AND I WANT TO GET A HEADSTART OVER MY PEERS.

THANKS A LOT

VIJAY

**Physics Forums | Science Articles, Homework Help, Discussion**

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!

# Homework Help: Obstuse trignometry

**Physics Forums | Science Articles, Homework Help, Discussion**