Trigonometry - Negative angle identities

If you have a negative angle these formulas can help you change it into an expression with a positive angle. These are also called the even and odd identities.

[webdevmarcus]

So clear. Your channel is absolutely amazing.

[meghatalukdar]

thank you so much sir...love and respect from india

[johntindell]

Thank you very much, your explanations were immensely helpful

[_icrop_]

This thing was really confusing thanks for clearly explaining😀
Love from Pakistan

[anbu]

can you explain the wave graph you used for explaining sin and cos?

[victortorres]

how do you know whats even and whats odd?

[zakirshah]

best trick to remember is
Some People Have Curly Brown Hair Through Proper Brushing!
love from PAKISTAN!

[ahmadferwaneh]

Thank you very much sir, you helped me alot.

[rishitshah]

sir I have one doubt sir please
sir what will be the sin of the -7π/2 fro one unit circle
answer is coming one 1 and it is positive sir how please explain