Question 1084120
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{{{theta}}} = {{{-3pi/4}}} = {{{5pi/4}}}.


{{{sin(5pi/4)}}} = {{{-sqrt(2)/2}}}.    You must know it !


{{{cos(5pi/4)}}} = {{{-sqrt(2)/2}}}.   You must know it !



After these hints EVERYBODY must be able to complete the assignment on his/her own.
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