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Ohsnapitzme

  • 3 years ago

Find the exact value of each expression without a calc.? cos(-π/6)sin(-π/4)-tanπ/4

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  1. cory_ryan
    • 3 years ago
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    cos(-π/6)=-sqrt3/2 sin(-π/4)=-sqrt2/2

  2. cory_ryan
    • 3 years ago
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    -1

  3. shining
    • 3 years ago
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    cos (-x)=cos(x) cos(pi/6)=sqrt3/2 sin(pi/4)=sqrt2/2 tan(pi/4)=1 now solve

  4. Ohsnapitzme
    • 3 years ago
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    So i get the sol for the 3 equations separately and that's just my answer? Why are the eq stuck together then?

  5. shining
    • 3 years ago
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    multiply them

  6. Ohsnapitzme
    • 3 years ago
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    hold on

  7. Ohsnapitzme
    • 3 years ago
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    sqrt 6/2?

  8. shining
    • 3 years ago
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    so the answer is sqrt3/2 * (-sqrt2/2) -1

  9. Ohsnapitzme
    • 3 years ago
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    sqrt6 - 2/2?

  10. cory_ryan
    • 3 years ago
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    that should be your answer!

  11. Ohsnapitzme
    • 3 years ago
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    Awesome, great thanks :)

  12. cory_ryan
    • 3 years ago
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    yeah

  13. shining
    • 3 years ago
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    good

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