# basic math question

• Feb 3rd 2010, 08:19 PM
ceroseven
basic math question
What is the sin225 degrees + tan45 degrees?

What I did was:
sin(180+45) which would be 0 and the square root of 2/2 respectively.
Then the tan of 45 is 1...

When I tried to solve for it I got squareroot of 2/2 + 1. This was not given as any of the four answer choices so I suppose it is wrong... what is the answer?
• Feb 3rd 2010, 08:24 PM
Chris L T521
Quote:

Originally Posted by ceroseven
What is the sin225 degrees + tan45 degrees?

What I did was:
sin(180+45) which would be 0 and the square root of 2/2 respectively.
Then the tan of 45 is 1...

When I tried to solve for it I got squareroot of 2/2 + 1. This was not given as any of the four answer choices so I suppose it is wrong... what is the answer?

sin(225) is a negative value...so how would you correct your answer?
• Feb 3rd 2010, 08:32 PM
ceroseven
Alright.. So would this mean that the answer is negative square root of 2 + 1?
• Feb 3rd 2010, 08:37 PM
Chris L T521
Quote:

Originally Posted by ceroseven
Alright.. So would this mean that the answer is negative square root of 2 + 1?

(Yes) $1-\frac{\sqrt{2}}{2}$ is correct (I put it in a different form, but its the same thing).