SOLUTION: I'm having a little trouble with Algebra 2. Here's the problem. Find the exact value of each trigonometric function.
(A) sin 270o =
(B) cot (3 pi /2) =
I'm using a TI-
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Question 956408: I'm having a little trouble with Algebra 2. Here's the problem. Find the exact value of each trigonometric function.
(A) sin 270o =
(B) cot (3 pi /2) =
I'm using a TI-83 Plus calculator, but I'm not sure how to input it. For (A) I came up with 'cot 4.71', but how do I calculate it?
PS, (A) and (B) are not part of the equation, my question is just divided into two parts.
Any help is appreciated, thanks!
Found 2 solutions by stanbon, MathLover1:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Find the exact value of each trigonometric function.
(A) sin 270 degrees = -1
--------------------------------
(B) cot (3 pi /2) = 0
--------------------------------------
I'm using a TI-83 Plus calculator, but I'm not sure how to input it. For (A) I came up with 'cot 4.71', but how do I calculate it?
-------------------------
Since tan(3pi/2) = -oo, cot(3pi/2) = 1/tan(3pi/2) = 0
Or Use 1/tan(4.71) = 0
Make sure your "MODE" (3rd line) is set to RADIANS.
------------
Cheers,
Stan H.
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
A.
....recall that angle ° directly across ° on unit circle; ° is equal to then ° is equal to
B.
on unit circle corresponds to °
Let's start with tangent. Tangent at degrees is . Since is the reciprocal of , that means you have to do .
, then , which is your answer.
so,
or, do it using unit circle (cos,sin) values
we now that
we can see on unit circle that and
then
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