Answers edited by Manikandan S.

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• How do you evaluate `sec(pi/9)`?
  
• Question #50ade
  
• Question #434fe
  
• Question #842f0
  
• `cos 4x=8cos^4(x)-8cos^2x + 1` and `cos 4x=8sin^4(x)-8sin^2x + 1`,can u prove it?
  
• What determines the magnitude of the equilibrium constant of the autoprotolysis reaction of water? `2H_2O(l) rightleftharpoons H_3O^+ + HO^(-).` `K_w=10^(-14).`
  
• Question #90983
  
• Question #2262f
  
• Given `f(x) = x^4+ax^3+bx^2+cx+d` with `f(1) = 1`, `f(2) = 5`, `f(3) = 19` and `f(6) = 665`, what is the value of `f(4)+f(5)` ?
  
• Verify this is an identity? `2 sin^2 (u/2)=sin^2u/(1+cosu)`
  
• What is the integral of `sec^3(x)`?
  
• Y'+ytanx=0 (How about y. y=?)
  
• Suppose a log's mass is 5 kg. After burning, the mass of the ash is 1 kg. What may have happened to the other 4 kg?
  
• Question #d62d3
  
• Question #97721
  
• What do Oxidation numbers tell you?
  
• Represent all the trigonometric ratios as positive and negative in the 4 quadrants?
  
• How do you simplify `2\root[ 3] { 16x ^ { 2} y ^ { 7} }`?
  
• Question #1892e
  
• How do you simplify `2 times (3-5) + 6`?
  
• How do we know which ions each element forms? And how do assign charges in complex ions?
  
• What are the data analysis tools used for?
  
• How do you graph `y = 1 + |x-1|`?
  
• Water vapor is water as a: solid, liquid, or gas?
  
• How do you solve `2cot^4x-cot^2x-15=0`?
  
• What is the molecular equation described by the following? Solid sodium bicarbonate reacts with aqueous acetic acid to produce aqueous sodium acetate, liquid water, and carbon dioxide gas.
  
• In what way is the functional group of an ester different from that of a carboxylic acid?
  
• How do you solve rational equations `2/(3x+1) = 1/x - (6x)/(3x+1)`?
  
• Why is benzene separated from water using a separatory funnel?