Questions asked by Alexander R.

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• How to prove that #(2cos^3theta-costheta)/(sinthetacos^2theta-sin^3theta)=cottheta# ?
  
• Does #sin^2theta-cos^2theta=1-2sin^2theta#?
  
• Can an equation in standard form have fractions?
  
• The line #3x+4y-k=0# is tangent to the circle #x^2+y^2=16#. What are the possible values of k?
  
• How do I solve #6csc^2x=cotx+8# if #o<x<360#?
  
• How to solve #4sintheta=3cosectheta# if #0<x<360#?
  
• How to solve #cosxtanx+tanx=cosx+1# if #0<x<360#?
  
• How to solve #cos^2theta-costheta=0# if #0<x<360#?
  
• How do you prove that #2cos(theta+pi/3) = costheta-sqrt3sintheta#?
  
• How do you prove that #tan15=2-sqrt3#?
  
• If #sintheta=5/13# and #theta# is acute, how do you find #sin2theta#?
  
• How do you prove that #cos2x+cosx=(cosx+1)(2cosx-1)#?
  
• How do you prove that #costheta-sinthetasin2theta=costhetacos2theta#?
  
• What is the general solution for #4cosx+3sinx=-1#?
  
• How to find the general equation of #2cos2theta=4costheta-3#?
  
• How to find general solution of #costheta=sintheta-1#?
  
• General solution for #2sin^2x+cosx=1#?