Proving Trigonometry identies??

• prg

  22 Dec 08, 00:13

  Starting from identity 

  prove that 

  How to prove this with the right steps in proving any identity

• Arkansaw

  22 Dec 08, 00:17

  wah your formula skill is champion
• Arkansaw

  22 Dec 08, 00:19

  u ish mean sign sguare tither pruss cosign sguare tither equalsi wan?
• Arkansaw

  22 Dec 08, 00:20

  ah i remember liaoz just divide all by cosign sguare
• eagle

  22 Dec 08, 00:25

  Starting from sin² Φ + cos² Φ = 1

  Prove that sec² Φ = 1 + tan² Φ

  This is a standard O levels question

  Divide throughout by cos² Φ and you will get the answer

• Arkansaw

  22 Dec 08, 00:27

  aiyoh, eagle u also know that first equation cannot have solution like that
• 190

  30 Dec 08, 18:38

  eagle: how do you type sin² Φ + cos² Φ = 1 here?

• eagle

  30 Dec 08, 18:39

  Originally posted by 190:

  eagle: how do you type sin² Φ + cos² Φ = 1 here?

  start => run => charmap

  choose there, or simply type phi in the advanced search