If Θ lies in 1st quadrant and cos Θ=8/17.
Then prove that,,

Cos(∏/6 + Θ) +cos(∏/4 –Θ) +cos(2∏/3) –Θ) =
{ (√3 – 1) / 2 + 1 / √2 } 23/17

• the question is not clear so here ends the puzzle
  
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• 12 years agoHelpfull: Yes(2) No(2)
• Question not clear. Hence it is closed.
• 12 years agoHelpfull: Yes(1) No(1)