Question

evaluate trig expression
sin(81pi/4) tan(-11pi/3) and sec(17pi/6)
how do I evaluate these expressions?

Answer 1

sin (81pi/4) = sin (pi/4) = \(\dfrac{\sqrt{2}}{2}\)
tan (-11pi/3) = tan (pi/3) = \(\sqrt{3}\)
sec (17pi/6) = sec (5pi/6) = \(\dfrac{-2\sqrt{3}}{3}\)
replace all to get the answer

Answer 2

Do you know how to find coterminal angles?

Answer 3

And do you know the special right triangles? 30-60-90 and 45-45-90?

Answer 4

no how do you find the angles?

Answer 5

also i thought that the tan one was 2pi/3 why is it pi/3?

Answer 6

I give you the first one, Ok
81pi/4 from pi/4

Answer 7

ok

Answer 8

now, I just count