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kaylala

  • 2 years ago

Find the value of the following using the concepts of both addition and subtraction formulas and reference angle: sin 255

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  1. kaylala
    • 2 years ago
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    @eliassaab

  2. kaylala
    • 2 years ago
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    @ganeshie8

  3. kaylala
    • 2 years ago
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    @Callisto

  4. eliassaab
    • 2 years ago
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    \[ \sin (225)=-\sin (360-255)=-\sin (105)=-\sin (45+60)=\\-\sin (45)) \cos (60)-\sin (60) \cos (45) \]

  5. eliassaab
    • 2 years ago
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    \[ -\sin (45)) \cos (60)-\sin (60) \cos (45)=-\frac{1+\sqrt{3}}{2 \sqrt{2}} \]

  6. kaylala
    • 2 years ago
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    why is it -sin(360-255) why the - sign there?

  7. eliassaab
    • 2 years ago
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    \[ -\sin(360-255)=- \sin (-255) =-(-\sin( 255)) = \sin(255) \]

  8. eliassaab
    • 2 years ago
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    Did you understand it?

  9. kaylala
    • 2 years ago
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    no sorry where did you get that?

  10. eliassaab
    • 2 years ago
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    If you add 360 to an angle you do not change the sine of that angle sin(360+y) = sin(y) sin( 360 +(-x)) =sin(-x) = -sin(x) If you do not know these elementary facts, please review them in your book or notes.

  11. eliassaab
    • 2 years ago
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    Have you heard about periodic functions?

  12. kaylala
    • 2 years ago
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    have no heard of periodic functions ever @eliassaab

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