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If sin of beta = 4/7, what is cos of beta?
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5 votes
If sin of beta = 4/7, what is cos of beta?

User Farshid Roohi
by
6.2k points

1 Answer

4 votes
sin²β +cos²β=1
cos²β=1-sin²β
cos²β=1-(4/7)²
cos²β=1-16/49=49/49-16/49=33/49
cosβ=√33/√49=√33/7
User Niana
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