What is the general solution for cos(x)=-4/5 ?

The general solution for cos(x)=-4/5 is x=2.49809…+2pin,x=-2.49809…+2pin

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cos(x)=-4/5

cos (x) = - \frac{4}{5}

x = 2.49809 \dots + 2 πn, x = - 2.49809 \dots + 2 πn

Solution steps

cos (x) = - \frac{4}{5}

Apply trig inverse properties

x = arccos (- \frac{4}{5}) + 2 πn, x = - arccos (- \frac{4}{5}) + 2 πn

Show solutions in decimal form

x = 2.49809 \dots + 2 πn, x = - 2.49809 \dots + 2 πn

2 cos^{2} (x) + 11 sin (x) = 7

cos (x) csc (x) = 2 cos (x)

cot (x) = \frac{1}{3}

2 sin (3 x - \frac{π}{3}) = - 3, 0 \leq x \leq 2 π

sin (x) = 2 \cdot sin (3 x)

What is the general solution for cos(x)=-4/5 ?
The general solution for cos(x)=-4/5 is x=2.49809…+2pin,x=-2.49809…+2pin