Are 'in' and 'for' correctly used in the sentences? Are the highlighted words correctly used, too?

Are 'in' and 'for' correctly used in the sentences? Are the highlighted words correctly used, too?

1. "You have to unleash your creativity in the tasks assigned to you,” Professor Jones reminded the students, “but make sure that you can correctly follow the instructions in undertaking those tasks.”

2. My cousin, who is a Muslim, says that a true leader glorifies Allah in everything he/she thinks, says, and does and that there is no better example for true leadership than Muhammad.

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