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Don't understand this incline problem. How exactly does the answer end up being mgsin theta?

Q1: A box of mass m is at rest on an incline with angle θ. The coefficient of static friction between the box and the incline is μ part 1: Which of the following must be true of the force of static friction on the box? js mgsin(9) Of- mgcos(0) part 2: Which force is the Newtons 3rd law pair for the normal force on the box? O The weight of the box O The force of static friction on the box O The normal force of the box on the incline O Wcos(e), one component of the weight

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