Question 1034534
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Write each equation in the form of an inverse function. 


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1. B = cos a                      a = arccos(B)  ( + {{{2k*pi}}}, for generality)

2. tan B = a                      B = arctan(a)  ( + {{{k*pi}}}, for generality)

3. y = tan 120                    120° = {{{pi}}} - arctan(y)   ( think why it is so )

4. -1/2 = cos x                   x = arccos({{{-1/2}}})   ( + {{{2k*pi}}}, for generality)

5. sin 2pi/3 = square root 3/ 2   {{{2pi/3}}} = {{{pi}}} - arcsin({{{sqrt(3)/2}}})    ( think why it is so ! )

6. cos pi /3 =1/2                 {{{pi/3}}} = arccos({{{1/2}}})
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