Algebra
cos(-9∏/4)=
cos(-9∏/4)=
2 Answers
shivang belwariar
cos(-9∏/4)= cos(9∏/4)= cos(2∏+∏/4) = cos(∏/4) =cos(45) = 1√2
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Shrawan Kher
cos(9pie/4)
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