Anonymous
Anonymous asked in Science & MathematicsMathematics · 2 months ago

Math help?

A)Without using a calculator, compute the sine and cosine of 330 degrees by using the reference angle. 

B)What is the reference angle___degrees. 

C)In what quadrant is this angle? (answer 1, 2 , 3, or 4)

D) sin(330 degrees) = ?

E) cos(330 degrees) =?

3 Answers

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  • ?
    Lv 7
    2 months ago

    (B) 30 degrees.

    (C) 4.

    (D) -1/2.

    (E) +sqrt(3)/2.

  • ?
    Lv 7
    2 months ago

    B.  360 - 330 = 30 <<  ref. angle

    A.  Sin 30 = 1/2

        sin 330  -- Quad 4  ... sin 330 = - sin 30 = -1/2

        cos 30 = (sqrt3) / 2

        cos 330 = cos 30 = (sqrt3) / 2

    C  330 is in Q4

  • rotchm
    Lv 7
    2 months ago

    Sketch out your trig circle and locate 330 deg on it. Upload your sketch here and then we will take it from there. 

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