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Please help me with this question! Explanation isn't necessary but would be helpful :)

Please help me with this question! Explanation isn't necessary but would be helpful-example-1
User Sharath
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Do know trig? you'll find out that AB is Hypotenuse and we also know the Adjacent side if you don't please take a look at the image below and the cos alpha is equal to Adjacent side/Hypotenuse = AC/AB so AB is Adjacent side/cos alpha

Please help me with this question! Explanation isn't necessary but would be helpful-example-1
User IgnisFatuus
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