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About Scott A Wilson
Expertise
I can answer any question in general math, algebra, complex mathematics, trigonometry, pre-calculus, probability, statistics, ... is there an end to this list?

Experience
Experience in the area; I have tutored people over the years in algebra, basic math, and statistics. I worked at The Boeing Company for over 5 years. Education/Credentials: MS degreee in Mathematics from Oregon State Univeristy; taken well over 100 hours of upper division credits in mathematical courses such as calculus, statistics, probabilty, linear algrebra, powers, linear regression, matrices, and more. I graduated with honors. Past/Present Clients: College Students at OSU, various math people since college, over 700 people in math and calculus.
 
   

You are here:  Experts > Science > Mathematics > Advanced Math > Trig Identites

Topic: Advanced Math



Expert: Scott A Wilson
Date: 5/11/2008
Subject: Trig Identites

Question
Hi, I'm having trouble solving this trig identity,
1-(sin^2xtanx/tanx+1)-(cos^2x/1+tanx)=sinxcosx


Answer
Is this really suppose to be
1-(sin^2(x)tan(x)/(tan(x)+1))-(cos^2x/(1+tan(x))=sin(x)cos(x)?
I think so!

Turn tan(x) into sin(x)/cos(x), don't forget parentheses, and combine the fractions.  You will get a sin^3(x)+cos^3(x) on top.
Note the a^3+b^3=(a+b)(a^2-ab+b^2).

Thanks for this and previous questions this year.  

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