Question

Find the principal solution:cos theta=1/2​

Answer 1

Answer:

cos theata =1/2

cos x=cos 60⁰

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Answer 2

Answer:

∴cosx=(

3

π

) and cos x = cos(2π−

3

π

) =cos(

3

5π

) such that 0<

3

π

<2π and 0<

3

5π

<2π

∴ The required principal solutions are x=

3

π

and x=

3

5π