exam Maths Puzzle Numerical Ability

7cos(2*x)+sin(x)=7 [0, 2pi]
4sin(2*x)+cos(2*x)=0 [0, 2pi]
cos(2*x)-sin(x)=0 [0, 2pi]

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Please explain and show me how to solve this promblem. That way I don't need to ask again.Thanks!

Kristen earns $7 per hour at a video store and $10 per hour at a landscaping co
PLease help me to solve the following :

Draw and label a figure for the situation described below.

On line L, ray AB and ray CD have no points in common.

thank you!