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rubyhunter

  • 3 years ago

find the sin(x+pi) in terms of x (HELP ME!!!!)

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  1. jishan
    • 3 years ago
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    - sinx

  2. rubyhunter
    • 3 years ago
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    what does that mean ?

  3. rubyhunter
    • 3 years ago
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    can you walk me through it

  4. jishan
    • 3 years ago
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    that means angle lies in 3rd quadrant.

  5. rubyhunter
    • 3 years ago
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    i still dnt get it how do i plug it in

  6. rubyhunter
    • 3 years ago
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    is it sin(x=180) = -sinx

  7. rubyhunter
    • 3 years ago
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    or am i way off

  8. jishan
    • 3 years ago
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    in 3rd quadrant sin ,cos,sec,cosec -ve but tan, cot +ve.

  9. rubyhunter
    • 3 years ago
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    IM FREAKING LOST

  10. jayz657
    • 3 years ago
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    using the trig identity sin(a+b) = sin(a)cos(b) + cos(a)sin(b) sin(x+pi) = sin(x)cos(pi)+ cos(x)sin(pi) cos(pi) = -1 sin(pi) = 0 and you get sin(x)(-1) + cos(x)(0) = -sin(x)

  11. Praja_01
    • 3 years ago
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    sin(180+x)= -sinx since sin is symmetrically opposite.

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