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Find the exact value of sin 225º without using a calculator

Find the exact value of sin 225º without using a calculator
asked 14.8k views
4 votes
Find the exact value of sin 225º without using a calculator

asked
User Ejolly
by
8.5k points

2 Answers

6 votes

Explanation:


\sin \: 225 \degree \: \\ = \sin \: (180 \degree + 45\degree) \\ = - \sin \: 45 \degree \\ = - (1)/( √(2) ) \\ = - (√(2))/(2)\\</p><p>= - (1.4142)/(2)\\=-0.7071</p><p> \\ \red{ \boxed{\therefore \: \sin \: 225 \degree = - 0.7071}}

answered
User Pranay Rana
by
7.6k points
6 votes

Answer:

-√2+√6/4

Explanation:

answered
User Jamie Bisotti
by
8.1k points
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