How do you evaluate sine, cosine, tangent of 405 without using a calculator?

1 Answer
Feb 20, 2018

sin(405)=(12)

cos(405)=(12)

tan(405)=1

Explanation:

sin(405)=sin(36045)=sin(45)=sin45=(12)

cos(405)=cos(36045)=cos(45)=cos45=(12)

tan(405)=tan(36045)=tan(45)=tan45=1