trig functions

[zellyen]

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do we got to know the sin2x and cos2x identities?

also for permutations and combinations (always been bad at that stuff)
how do i remember this stuff easily other than just memorizing the formula

because its different for permutation and combination, and theres also the case with no repeating and repeating permutations and combinations

ahhhh god i hope i dont fail lol

 

[ZzZzSleepyhead]

I feel your pain.