Question
I'm having trouble understanding a sine concept.
For instance, I know that the sine of 15 is .25881. Likewise, the sine of 165 is also .25881. How can I find other values of sine that also equal .25881?
Thank you very much.
For instance, I know that the sine of 15 is .25881. Likewise, the sine of 165 is also .25881. How can I find other values of sine that also equal .25881?
Thank you very much.
Answers
Reiny
This requires an understanding and knowledge about the sine curve and the CAST rule.
The curve repeats every 360º
so if sin 15º=.258819
then sin 375 = .258819
and sin 735 = .258819
and sin (-345) = .258819
in other words you can add or subtract multiples of 360 to 15 and the sine of that angle will be .28819
do the same thing with 165º
The curve repeats every 360º
so if sin 15º=.258819
then sin 375 = .258819
and sin 735 = .258819
and sin (-345) = .258819
in other words you can add or subtract multiples of 360 to 15 and the sine of that angle will be .28819
do the same thing with 165º
Reiny
I meant to include the webpage on the CAST rule
http://www.physics.uoguelph.ca/tutorials/trig/trigonom2.html
http://www.physics.uoguelph.ca/tutorials/trig/trigonom2.html