Question

please help me
find the values by referring to the graphs of the trigonometric functions. if the value is undefined write undefined.

1. tan(-3/2pi)
2. cot(3/2pi)
3. sec 4pi
4. csc(-7/2pi)

Answer 1

Well knowing that pi =180

1. tan(-3/2pi) = tan(-270)
2. cot(3/2pi) = cot(270)
3. sec 4pi = sec(720)
4. csc(-7/2pi) = csc(-630)

Is that it, or you need an exact value?

Answer 2

i need the exact value

Answer 3

you can use the trigonometric table,
http://mathmistakes.info/facts/TrigFacts/learn/vals/sum.html

Answer 4

you can use a circle to first reduce angles bigger than 360.

Answer 5

tan(-3/2pi) = (as tan is negative in 2nd quadrant) and it is = -sqrt3

Answer 6

sorry im a bit confused

Answer 7

I wrote too many replies, lets work each one together.

Answer 8

ok

Answer 9

Don't even know how to start,
1)
It is going to be in second quadrant, because it's negative so,) lets find the positive value (we know from a trigonometric table, http://mathmistakes.info/facts/TrigFacts/learn/vals/sum.html that) tan(3/2 pi)= -sqrt3

Answer 10

I am really bad at explaining this staff, I think you need a tutor from OS to do this, not someone like me....

Answer 11

@agent0smith, I'm not good at explaining can you help?