Question

Quick Question!

Answer 1

Which of the following is equal to tan theta cos theta when sin theta =2/3 and 0< theta< pi/2?

Answer 2

tan a=2/\[\sqrt{5}\]

Answer 3

Which of the following is equal to \[\tan \theta \cos \theta \] when \[\sin \theta=2/3 \] and \[0<\theta<\pi/2\]

F. 2/3
G. \[\frac{ 2\sqrt{5} }{ 9 }\]
H. \[\frac{ \sqrt{5} }{ 3 }\]
J. \[\frac{ 2\sqrt{5} }{ 5 }\]
K. 1

Answer 4

The answer is F, but why?

Answer 5

How would I use it?

Answer 6

tan a* cos a=sin a/cos a * cos a
=sin a

Answer 7

use this its easy

Answer 8

since tan a=sin a / cos a

Answer 9

got it

Answer 10

hmm I'm confused..

Answer 11

break tan into sin and cos and put in

Answer 12

Yup I understand that but I don't know what to put in my calculator

Answer 13

Sorry I'm new to this

Answer 14

no need to use calculator

Answer 15

Wait! I got it

Answer 16

Also, are there any other rules I should know besides tan a = sin a/cos a ?

Answer 17

cot a= cos a/ sin a
sin a=1/cosec a
cos a =1/sec a

Answer 18

tan a=1/cot a

Answer 19

Thanks!!!

Answer 20

Also what are the main ones I should memorize? @Er.Mohd.AMIR