Question

How do I do this Trigonometry question?

Answer 1

\[\sec(-\frac{ 3 \pi}{ 4 }) -\cot \frac{ \pi }{ 2 } + \csc \frac{ 3 \pi }{ 2 }\]

Answer 2

use the identities
sec = 1/cos, cot=1/tan and csc = 1/sin

then its a matter of plugging the values into your calculator

Answer 3

to find cot pi/2:- find tan pi/2 - say its comes to 0.5 then cot pi/2 = 1/0.5

Answer 4

Wait so I must find the tangent of 90 degrees then? Since pi/2 is technically 90 degrees?

Answer 5

yes the angles are given in radians - so you set your calculator to radians or do the conversion

Answer 6

oh hold on tan pi/2 is indeterminate as it = 1/0 but the cot is 0/1 so that is 0

Answer 7

you are correct about sec = -sqrt2

Answer 8

now find sin (3pi/2)

Answer 9

0?

Answer 10

no not 0

Answer 11

sin(3pi/2) i meant

Answer 12

-1.

Answer 13

\[-\sqrt{2} - 1\]

Answer 14

Jojokiw3 has given you the answer but I would have preferred if you had found it yourself

Answer 15

Well it's my question. o_O

Answer 16

oh sorry yes

Answer 17

haha lol. Thanks!

Answer 18

lol yw

Answer 19

i somehow mixed you up with the other guy!