hello!

Our Math14(Trigonometry) professor gave us problem sets, and these sets got me crazy for weeks already... help!

1. Find tan 35pi/4
   
2. Graph y = cos²x - 2sinx

I would really appreciate it if you could send your reply as early as possible...

Thank you so much!

Chiara

(College Freshaman Student)

I can give you some help in getting started on the first problem.

1. Divide 4 into 35 to get 8 + ³/₄. Thus
   
   tan( ^35pi/₄) = tan(8pi + ^3pi/₄)
   But the tangent function is periodic with period pi and hence
   
   tan( ^35pi/₄) = tan(8pi + ^3pi/₄) = tan( ^3pi/₄)
   

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