Question

Find the sine, cosine, and tangent of 45 degrees.

a) Sin 45 degrees= -sqr 2/2, cos 45 degrees= -sqr 2/2, tan 45 degrees= -sqr 2
b) Sin 45 degrees= sqr 2/2, cos 45 degrees= sqr 2/2, tan 45 degrees= sqr 2
c) Sin 45 degrees= sqr 2/2, cos 45 degrees= sqr 2/2, tan 45 degrees= 1
d) Sin 45 degrees= sqr 2/2, cos 45 degrees= sqr 2/2, tan 45 degrees= -1

Answer 1

Do you have a guess?

Answer 2

You know the answer cannot be a or b as their tangents are 2 and because tangent is sin divided by cosine, you know that when two numbers that are exactly the same are divided, the solution is 1.

Answer 3

I'm not good at these

Answer 4

We will work through together. Do you understand how the tangent of 45 is 1 or -1?