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    Patricio Roblez's Avatar
    Patricio Roblez Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Dec 17, 2014, 01:21 PM
    please help me with tihis 1-sen^3xcosx + cos^3xsenx=1-senxcosx
    Please I need help with this resolution many trigonometric identities
    Curlyben's Avatar
    Curlyben Posts: 18,514, Reputation: 1860
    BossMan
    		  
    #2

    Dec 17, 2014, 01:26 PM
    What do YOU think ?
    While we're happy to HELP we wont do all the work for you.
    Show us what you have done and where you are having problems..
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #3

    Dec 17, 2014, 02:20 PM
    I don't know what "senx" is, but let me give some general advice about how to approach this problem.

    1. Convert any tangent, cotangent, secant, and cosecant functions to their sine and cosine equivalents.
    2. Simplify any fractions that are a result
    3. Look for opportunities to apply simple identities such as sin^2x + cos^2x = 1, sin(2x) = 2 cos(x)sin(x), and cos(2x) = cos^2x - sin^2x = 1-2sin^2(x) = 2cos^2x - 1.
    4. And simplify some more.

    These steps will let you solve about 95% of all trig identity problems. Good luck!
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