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Update substitution2.tex #936

Open pfatheddin opened 8 months ago

pfatheddin commented 8 months ago

https://ximera.osu.edu/mooculus/substitution/exercises/exerciseList/substitution/exercises/substitution2

Took out the hint. They should recognize 1/cos is sec since they have tan in the problem. I think it is not needed and it is good for them to figure it out.