What is the general solution for cos(x)= 3/10 ?

The general solution for cos(x)= 3/10 is x=1.26610…+2pin,x=2pi-1.26610…+2pin

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cos(x)= 3/10

cos (x) = \frac{3}{10}

x = 1.26610 \dots + 2 πn, x = 2 π - 1.26610 \dots + 2 πn

Solution steps

cos (x) = \frac{3}{10}

Apply trig inverse properties

x = arccos (\frac{3}{10}) + 2 πn, x = 2 π - arccos (\frac{3}{10}) + 2 πn

Show solutions in decimal form

x = 1.26610 \dots + 2 πn, x = 2 π - 1.26610 \dots + 2 πn

5 cos (3 x + 60) = 4

3 sin^{2} (x) = 0

\frac{5 3}{3} cos (x) = 1 + 3 cos (x)

sin (x) n = 3

3 cos (2 x) = 4 - 11 cos (x)

What is the general solution for cos(x)= 3/10 ?
The general solution for cos(x)= 3/10 is x=1.26610…+2pin,x=2pi-1.26610…+2pin