8+9 can be calculated by using subtraction, here is how:
Factoring quadrics by grouping can be challenging sometimes. Here is how I do it: https://youtu.be/WybjQ6PA8OM?si=nPiwJaB42SGbL-fV
Trick to check if one integer is divisible by another: https://youtu.be/5KgKnmWCQPM?si=MeSKFM7HEbBndsn5
Can we tell if 292 is divisible by 4 without actually doing a division?
How to approach proving trigonometric identities? https://youtu.be/EPg4FCE7fps?si=V5dx8-Mdx9MppNyi
What is sets in Probability?
Probability P(event A or event B) vs Probability P(event A and event B)
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