Trigonometric ratios and functions, the unit circle, inverse trig functions, identities, trig graphs, etc.
huriah
Posts: 7
Joined: Thu Mar 20, 2014 5:36 pm
Contact:

HI,
I am preparing for CAT (Cunny assessment test).I am doing trigonometry and I have problem in solving trigonometric equation. I have studied reference angle, but I did not understand how to use the reference angles in solving trigonometric equations. It is very simple but I think I am missing something. I have been out of college for ten years. Could u please help me in solving the following trigonometric equation so that I can do rest of equations on my own. Thanks.
sin (x) + 2 = 3 for 0 degree <= x <= 30 degree.
sin x = 1
x = 90.
Could you please explain me how x= 90 by using reference angle.

stapel_eliz
Posts: 1628
Joined: Mon Dec 08, 2008 4:22 pm
Contact:
I have studied reference angle, but I did not understand how to use the reference angles in solving trigonometric equations....

sin x = 1
x = 90.
Could you please explain me how x= 90 by using reference angle.
When you learned about reference angles (being 0, 30, 45, 60, and 90) and memorized the table of values, what value did you memorize for the sine of 90 degrees?

Given "sin(x) = 1", to what reference angle "x" does correspond?

Plug that value in for "x".

huriah
Posts: 7
Joined: Thu Mar 20, 2014 5:36 pm
Contact: