What is the general solution for cos(x)= 84/98 ?

The general solution for cos(x)= 84/98 is x=0.54109…+2pin,x=2pi-0.54109…+2pin

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cos(x)= 84/98

cos (x) = \frac{84}{98}

x = 0.54109 \dots + 2 πn, x = 2 π - 0.54109 \dots + 2 πn

Solution steps

cos (x) = \frac{84}{98}

Cancel the common factor:

14

cos (x) = \frac{6}{7}

Apply trig inverse properties

x = arccos (\frac{6}{7}) + 2 πn, x = 2 π - arccos (\frac{6}{7}) + 2 πn

Show solutions in decimal form

x = 0.54109 \dots + 2 πn, x = 2 π - 0.54109 \dots + 2 πn

cos (\frac{3 θ}{2}) = \frac{1}{2}

0 = 5 + 4 cos (x)

35708 = 35795 cos (x)

sin (θ) = \frac{2 - 3}{10}

sin (x) = 0.844

What is the general solution for cos(x)= 84/98 ?
The general solution for cos(x)= 84/98 is x=0.54109…+2pin,x=2pi-0.54109…+2pin