What is the general solution for cos(x)= 9/19 ?

The general solution for cos(x)= 9/19 is x=1.07732…+2pin,x=2pi-1.07732…+2pin

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cos(x)= 9/19

cos (x) = \frac{9}{19}

x = 1.07732 \dots + 2 πn, x = 2 π - 1.07732 \dots + 2 πn

Solution steps

cos (x) = \frac{9}{19}

Apply trig inverse properties

x = arccos (\frac{9}{19}) + 2 πn, x = 2 π - arccos (\frac{9}{19}) + 2 πn

Show solutions in decimal form

x = 1.07732 \dots + 2 πn, x = 2 π - 1.07732 \dots + 2 πn

cos (α) = \frac{5}{3}

2 - 3 sin (x) - cos (2 x) = 0

cos (2 θ) = \frac{1}{4}

sec (θ) = \frac{25}{7}

(3 + sin (x))^{2} = 13 - cos^{2} (x)

What is the general solution for cos(x)= 9/19 ?
The general solution for cos(x)= 9/19 is x=1.07732…+2pin,x=2pi-1.07732…+2pin