I need help answering these question - I

[krapinmypants]

 

[blamocur]

From Read Before Posting: Show your beginning work, or ask a specific question about the exercise, or explain why you're stuck.

 

[Deleted member 4993]

View attachment 30806

I have split your thread into two parts. you are allowed to post one problem per thread. Post the second problem in a separate thread.

Please show us what you have tried and exactly where you are stuck.

Please follow the rules of posting in this forum, as enunciated at:

READ BEFORE POSTING​

Please share your work/thoughts about this problem.

 

[Otis]

Hello KIMP. Have you learned the right-triangle definition for cosine? (If you don't have a textbook, you can learn about it here.)

Let the given diagram be a unit circle. Draw a representative right triangle in each quadrant where cosine is negative.

Perhaps your class has discussed some "special angles" (eg: 30º, 45º, 60º) for which you're expected to memorize the sine and cosine. Does that sound familiar?

Please let us know where you're stuck. Thanks!

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