How do you evaluate sine, cosine, tangent of #-405^circ# without using a calculator?

1 Answer
Write your answer here...
Start with a one sentence answer
Then teach the underlying concepts
Don't copy without citing sources
preview
?

Answer

Write a one sentence answer...

Answer:

Explanation

Explain in detail...

Explanation:

I want someone to double check my answer

Describe your changes (optional) 200

1
Feb 20, 2018

Answer:

#sin(-405) = -(1/sqrt2)#

#cos(-405) = (1/sqrt2)#

#tan(-405) = -1#

Explanation:

#sin (-405) = sin (-360 - 45) = sin (-45) = - sin 45= -(1/sqrt2)#

#cos (-405) = cos (-360 - 45) = cos (-45) = cos 45= (1/sqrt2)#

#tan (-405) = tan (-360 - 45) = tan (-45) = - tan 45= -1#

Was this helpful? Let the contributor know!
1500