If cosx=3/5 then cos(2π+x)=

Calculus
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If cosx=35 then  cos(2π+x)=
May 26th, 2015

First we need to find the value of x.

cosx = 3 / 5   is also   cos^-1(3/5) = x

cos^-1(3/5) = 53.13

So, cos(2π + 53.13) = cos(59.41)

Finally, cos(59.41) = 0.509

May 26th, 2015

Apologies. I did that in degrees by accident.

cosx = 3 / 5   is also   cos^-1(3/5) = x

cos^-1(3/5) = .9273

So, cos(2π + .9273) = cos(7.21)

Finally, cos(7.21) = .6 or 3/5


May 26th, 2015

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