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@jim_thompson5910 @ParthKohli help please :)

You could just plug in x=cos40

all you need to do is find the cosine of 40 degrees and replace x in the equation.
cos40=0.7660

oh :) thank you so much. didnt have any clue what to do :)

@jim_thompson5910 way is the best :) cause it uses trig which is the topic i am currently doing :D