what is the value of cos(-9π/4)
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cos(9π/4)
9π/4 can be written as 2π+π/4
So cos(9π/4)=cos(π/4) .....................cos(2π+n)=cos(n)
cos(π/4)=1/√2
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Step-by-step explanation:
cos(-9π/4)=-1/√2
cos(9π/4)=1/√2
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