What is the general solution for cos(d)= 9/15 ?

The general solution for cos(d)= 9/15 is d=0.92729…+2pin,d=2pi-0.92729…+2pin

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cos(d)= 9/15

cos (d) = \frac{9}{15}

d = 0.92729 \dots + 2 πn, d = 2 π - 0.92729 \dots + 2 πn

Solution steps

cos (d) = \frac{9}{15}

Cancel the common factor:

3

cos (d) = \frac{3}{5}

Apply trig inverse properties

d = arccos (\frac{3}{5}) + 2 πn, d = 2 π - arccos (\frac{3}{5}) + 2 πn

Show solutions in decimal form

d = 0.92729 \dots + 2 πn, d = 2 π - 0.92729 \dots + 2 πn

coth^{2} (x) + csch^{2} (x) = 2

tan (x) = \frac{3}{9}

2 cos (x) = 3 cot (x)

sin^{2} (x) + 2 sin (x) - 1 = 0

1 = cos^{3} (x)

What is the general solution for cos(d)= 9/15 ?
The general solution for cos(d)= 9/15 is d=0.92729…+2pin,d=2pi-0.92729…+2pin