What is the general solution for cos(x)= 8/21 ?

The general solution for cos(x)= 8/21 is x=1.17997…+2pin,x=2pi-1.17997…+2pin

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cos(x)= 8/21

cos (x) = \frac{8}{21}

x = 1.17997 \dots + 2 πn, x = 2 π - 1.17997 \dots + 2 πn

Solution steps

cos (x) = \frac{8}{21}

Apply trig inverse properties

x = arccos (\frac{8}{21}) + 2 πn, x = 2 π - arccos (\frac{8}{21}) + 2 πn

Show solutions in decimal form

x = 1.17997 \dots + 2 πn, x = 2 π - 1.17997 \dots + 2 πn

cos (x) = 0, x = 0

2 cos^{2} (x) - 2 cos (x) - 1 = 0

sin (b) = \frac{1}{3}

35 + 53 sin (2 T - 31.9) = 0

cos (2 x) = - 12

What is the general solution for cos(x)= 8/21 ?
The general solution for cos(x)= 8/21 is x=1.17997…+2pin,x=2pi-1.17997…+2pin