Questions asked by Sam

• Back to user's profile
• How would you solve: tan(15 degrees)/1-tan^2(15 degrees)? (show steps) Thanks
  
• How would you solve: sin^2(pi/5)-cos^2(pi/5)? (show steps) Thanks
  
• How do solve how to solve cosx-2sin^2x=1?
  
• How do you solve: sin^2x-3sinx=0? Would it be no solution because if you take sin out of the equation and you're left with sinx=3?
  
• In the redox reaction: Cr2O72- + Fe2+ --> Cr3+ + Fe3+. What would the balanced reaction look like, and would CrO72- be the Reducing Agent, and Fe2+ be the Oxidizing Agent?
  
• In the reaction 2Na + Cl2 --> 2NaCl Would 2Na be the Reducing Agent, or would the reducing agent just be Na?
  
• Need help with the third, help?
  
• Can a system of two linear equations in three variables like(below) be consistent, inconsistent, and dependant, like a two linear equation system with two variables? -2x+3y-z=-1 x-2y+z=3 What about a system of three equations with three variables?
  
• Would this system be consistent, inconsistent, or dependent? Would it be dependent because x and z could be any real number?
  
• Nuclear Chemistry and Half-life calculations?