Trigonometric functions

[nerd]

I’m doing a review for my calculus class, and I remember learning this but forgot how to go about it. Any pointers for 35 and 36 would be great!

 

[topsquark]

I’m doing a review for my calculus class, and I remember learning this but forgot how to go about it. Any pointers for 35 and 36 would be great!View attachment 33804

35. Cosine is negative and sine is negative. Thus we are in QIII. [imath]cos( \theta ) = \dfrac{x}{r}[/imath], [imath]sin( \theta ) = \dfrac{y}{r}[/imath], and [imath]x^2 + y^2 = r^2[/imath].

Give it a try and show us what you've got.

-Dan

 

[BigBeachBanana]

I’m doing a review for my calculus class, and I remember learning this but forgot how to go about it. Any pointers for 35 and 36 would be great!View attachment 33804

Alternatively, draw triangles.

 

[Deleted member 4993]

I’m doing a review for my calculus class, and I remember learning this but forgot how to go about it. Any pointers for 35 and 36 would be great!View attachment 33804

Alternatively, use unit circle.

 

[nerd]

Tried it this way, am I right?

 

[Deleted member 4993]

View attachment 33805
Tried it this way, am I right?

Looks good to me.....

 

[nerd]

Thanks for the help!