What is the general solution for cos(x)= 10/21 ?

The general solution for cos(x)= 10/21 is x=1.07447…+2pin,x=2pi-1.07447…+2pin

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cos(x)= 10/21

cos (x) = \frac{10}{21}

x = 1.07447 \dots + 2 πn, x = 2 π - 1.07447 \dots + 2 πn

Solution steps

cos (x) = \frac{10}{21}

Apply trig inverse properties

x = arccos (\frac{10}{21}) + 2 πn, x = 2 π - arccos (\frac{10}{21}) + 2 πn

Show solutions in decimal form

x = 1.07447 \dots + 2 πn, x = 2 π - 1.07447 \dots + 2 πn

cos (θ) = \frac{2}{3.3 8 ^{2} + 2 ^{2}}

3 tan (θ) - cot (θ) = 5

cos (x) \cdot sin (x) = 1

3 tan^{2} (θ) + 2 tan (θ) - 3 = 0

sinh (x) = \frac{1}{2}

What is the general solution for cos(x)= 10/21 ?
The general solution for cos(x)= 10/21 is x=1.07447…+2pin,x=2pi-1.07447…+2pin