Trigonometry Functions and Angles
1)If sin(t) = -5/13 and 270 degrees is less than or
equal to t and is less than or equal to 360 degrees,
2)If 0 degrees is less than t and less than 90 degrees
and cos(t) = 4/5, then cos(2t)=?
3)A right triangle is shown, sec(t) =? . |
1 = hypotenuse . |
x = y side of triangle . | x
t = inside angle < t___________|
...is positive so the answer is 12/13.
2)cos(2t)=2*cos(t)^2-1=2*(16/25)-1=32/25-1=7/25 (and it does not matter here where t is).