Trigonometry Operations?

1 ⤊

Let t = theta.

If cos(t) = 0.2, find the value of cos(t) + cos(t + 2pi) + cos(t + 4pi).

2007-07-12 23:33:37 · 5 answers · asked by journey 1 in Science & Mathematics ➔ Mathematics

Cos t = cos (t + 2pi) = cos (t + 4pi)

so...
(0.2) + (0.2) + (0.2) = 0.6

2007-07-12 23:37:03 · answer #1 · answered by Mathematica 7 · 1⤊ 0⤋

cos t + cos t + cos t
= 3 cos t
= 3 (0.2)
= 0.6

2007-07-13 06:39:53 · answer #2 · answered by CPUcate 6 · 0⤊ 0⤋

Increasing an angle by 2pi leaves its cosine unchanged.
cos(t) + cos(t + 2pi) + cos(t + 4pi) = 3cos(t) = 0.6.

2007-07-13 06:49:51 · answer #3 · answered by Anonymous · 0⤊ 0⤋

cos t = 0.2 + 0.2 + 0.2
cos t = 0.6

2007-07-13 08:00:18 · answer #4 · answered by Como 7 · 0⤊ 0⤋

0.2+0.2+0.2 = 0.6

2007-07-13 06:38:00 · answer #5 · answered by harshadanywhere 3 · 0⤊ 0⤋