trig

posted by .

Suppose sin theda= – 3/5 and theda is a Quadrant III angle.

Find the exact value of sin 2 theda and cos 2 theda.

  • trig -

    It is theta not theda. Quadrant III= a reflex angle greater than 180 degrees and yet less than or = to 270 degrees.

  • trig -

    as measured counterclockwise from the origin (0,0).

  • trig -

    since sinØ = -3/5, in the third quad cosØ = -4/5

    sin 2Ø = 2sinØcosØ = 2(-3/5)(-4/5) = 24/25
    cos 2Ø = cos^2 Ø - sin^2 Ø = 16/25 - 9/25 = 7/25

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. math

    How to solve for delta using trig functions?
  2. physics

    Two blocks each with weight w are held in place on a frictionless incline. In terms of w ans the angle theda of the incline, calculate the tension in a) the rope connecting the blocks; b) the rope that connects block A to the wall?
  3. Physics

    A force F is exerted by a broom handle on the head of the broom, which is of mass m. The handle is at angle theda to the horizontal. (where it's tilted towards the left at about 30 degrees to the horizonal). The work is: a)fdsin theda …
  4. Physics

    A beam of light is incident on the surface of clear ice at 60 degrees with the normal. Find the angle between reflected and refracted ray. theda 1=60 n1= 1 (air) What would n2 be for clear ice?
  5. Physics

    A ray of light stikes a flat 2 cm thick block of ice (n=1.5) at an angle of 45 degrees. Refracted ray travels through the glass and then is refracted back to air at the opposite side of the block. Find the angles of incident and refraction …
  6. Physics

    n=1.331 for red light in water and n=1.34 for blue light in water. If a ray of white light enters the water at 83 degrees what are the underwater angles of refraction for the blue and red components of white light?
  7. Physics

    The incident ray comes at 30 degrees to normal at the air/glass boundary and is refracted at 18 degrees to normal. a) find index of refraction of glass b)find speed of light in glass c) under what conditions and for what angles will …
  8. Math

    Find the exact value of cot theda if theda is in standard position and (-7,2) is on the terminal side of Theda
  9. trig

    from the intervals 0 less than or equal to theda less than 2 pie, what is cot theda of 2
  10. MATH

    solve for theda given 0<theda<2pi cos theta= - (sqrt 3)/ 2

More Similar Questions