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anonymous

  • 5 years ago

simplify: cos(2x-y)cosy-sin(2x-y)siny

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  1. anonymous
    • 5 years ago
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    cos 2x

  2. anonymous
    • 5 years ago
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    how??

  3. anonymous
    • 5 years ago
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    cos (A+B)= cosAcosB - sinAsinB

  4. anonymous
    • 5 years ago
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    if u plug in A = 2x -y and B=y u get the same form

  5. anonymous
    • 5 years ago
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    woah thanks!

  6. anonymous
    • 5 years ago
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    noprob

  7. anonymous
    • 5 years ago
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    find all solutions in the interval [0,2pie) 3sin(2t-pie)=3

  8. anonymous
    • 5 years ago
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    sin (2t-pi) = 1 2t - pi = pi/2, 5pi/2.... 2t = 3pi/2, 7pi/2 t=3pi/4,7pi/4..and so on..there might be one more solution..check for more

  9. anonymous
    • 5 years ago
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    post new questions in the questions panel from now on

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spraguer (Moderator)
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