Homework Help Forum: Math - Trigonometry

Posted by Trevor on Tuesday, October 13, 2009 at 7:28pm.

Verify the following: 1. cos x/(1-sinx)= sec x + tan x 2. (tanx+1)^2=sec^2x + 2tan x 3. csc x = )cot x + tan x)/sec x 4. sin2x - cot x = -cotxcos2x

• Math - Trigonometry - Reiny, Tuesday, October 13, 2009 at 8:04pm

  Hint: change all trig ratios to sines and cosines. I will do one for you. 3. csc x = (cot x + tan x)/sec x RS = (cosx/sinx + sinx/cosx)/(1/cosx) = (cos^2 x + sin^2 x)/(sinxcosx) * cosx = (1/(sinxcosx)(cosx) = 1/sinx = csc x = LS

  
  

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