Answers edited by Manikandan S.

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• Verify this is an identity? #2 sin^2 (u/2)=sin^2u/(1+cosu)#
  
• What do Oxidation numbers tell you?
  
• What is the integral of #sec^3(x)#?
  
• 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)# ?
  
• In what way is the functional group of an ester different from that of a carboxylic acid?
  
• Question #2262f
  
• #cos 4x=8cos^4(x)-8cos^2x + 1 # and #cos 4x=8sin^4(x)-8sin^2x + 1#,can u prove it?
  
• Y'+ytanx=0 (How about y. y=?)
  
• Represent all the trigonometric ratios as positive and negative in the 4 quadrants?
  
• Question #434fe
  
• How do we know which ions each element forms? And how do assign charges in complex ions?
  
• Why is benzene separated from water using a separatory funnel?
  
• How do you evaluate #sec(pi/9)#?
  
• How do you simplify #2\root[ 3] { 16x ^ { 2} y ^ { 7} }#?
  
• Question #97721
  
• Question #842f0
  
• How do you solve #2cot^4x-cot^2x-15=0#?
  
• How do you solve rational equations #2/(3x+1) = 1/x - (6x)/(3x+1)#?
  
• 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 #1892e
  
• Question #50ade
  
• 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.
  
• 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 #d62d3
  
• Question #90983
  
• Water vapor is water as a: solid, liquid, or gas?
  
• What are the data analysis tools used for?
  
• How do you graph #y = 1 + |x-1|#?
  
• How do you simplify # 2 times (3-5) + 6#?