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

The general solution for cos(A)= 4/5 is A=0.64350…+2pin,A=2pi-0.64350…+2pin

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cos(A)= 4/5

cos (A) = \frac{4}{5}

A = 0.64350 \dots + 2 πn, A = 2 π - 0.64350 \dots + 2 πn

Degrees

A = 36.86989 \dots^{\circ} + 36 0^{\circ} n, A = 323.13010 \dots^{\circ} + 36 0^{\circ} n

Solution steps

cos (A) = \frac{4}{5}

Apply trig inverse properties

cos (A) = \frac{4}{5}

General solutions for

cos (A) = \frac{4}{5}

cos (x) = a \Rightarrow x = arccos (a) + 2 πn, x = 2 π - arccos (a) + 2 πn

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

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

Show solutions in decimal form

A = 0.64350 \dots + 2 πn, A = 2 π - 0.64350 \dots + 2 πn

What is the general solution for cos(A)= 4/5 ?
The general solution for cos(A)= 4/5 is A=0.64350…+2pin,A=2pi-0.64350…+2pin