Solve cos(x) - sin(x) = 1

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Always check for extraneous solutions if solving involves squaring both sides.

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Please watch: "Introduction to Statistics: Overview"
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Thank you so much. Now you have a student for Portugal * blink *

afonsofreire
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nice solution... Thank you professor.... I'm from Bangladesh... love you professor...

rumkyakter
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Ok! I got stuck with all the different possible answers and wasn't thinking how to check them!

jimnicholas
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Agradeço muito, estava meio perdido mas conseguir entender. Obrigado 😊 🇧🇷🇧🇷

Ruan_thander