trenger litt hjelp med denne:
cos 2v = 119/169 v∈<90°,180°>
er takknemelig for all hjelpen jeg kan få!
generell trigonometri
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klarte det nå. cos2v=1-2sin^2v
119/169-1=2sin^2v x1
-(119/169)+1=2sin^2v
119/169-1=2sin^2v x1
-(119/169)+1=2sin^2v