111k views
2 votes
What is the cosine of 135 degrees?

User Korinna
by
8.2k points

2 Answers

5 votes

cos(180^0- \alpha )=-cos \alpha \\ \\ cos135^0=cos(180^0-45^0)=-cos45^0=- ( √(2) )/(2)
User Muhsin
by
7.4k points
0 votes

cos135^o=cos(90^o+45^o)=-sin45^o=-(\sqrt2)/(2)\\\\reduction\ formulas:\ cos(90^o+\alpha)=-sin\alpha
User Alec Mev
by
8.8k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.