Periodic Functions?

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Use the fact that the trig functions are periodic to find the exact value of each expression. Do NOT use a calculator.

(1) sin390 degrees

(2) csc(9pi/2)

2007-07-12 23:15:15 · 2 answers · asked by Sharkman 1 in Science & Mathematics ➔ Mathematics

2 answers

Question 1
sin 390° = sin 30° = 1 / 2

Question 2
cosec (9π/2) = 1 / sin(9π/2) = 1 / sin π/2 = 1

2007-07-13 01:19:27 · answer #1 · answered by Como 7 · 0⤊ 0⤋

y = sin(2 pi f t + 30) . . . where f - frequency , . . t - time

y = sec (2 pi f t )

2007-07-12 23:28:23 · answer #2 · answered by CPUcate 6 · 0⤊ 0⤋