what trig identities are a must to have memorized? i have kinda just skimmed over them but i want to memorize the ones that are known to be essential thanks
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Trig identities
Started by juswanthatDDS
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Pretty much know:
45-45-90 triangles (along with sides)
30-60-90 triangles (along with sides)
And cos, sin, and tan (or the common mnemonic SOHCAHTOA).
Pretty much every other trig function/identity/value can be derived from these simple reference triangles. Of course, it doesn't hurt to remember some of them (such as sin^2(x) + cos^2(x) = 1).
45-45-90 triangles (along with sides)
30-60-90 triangles (along with sides)
And cos, sin, and tan (or the common mnemonic SOHCAHTOA).
Pretty much every other trig function/identity/value can be derived from these simple reference triangles. Of course, it doesn't hurt to remember some of them (such as sin^2(x) + cos^2(x) = 1).
would we have to memorize the unit circle?
If you're into memorizing large amounts of numbers, then sure go ahead. But you can derive pretty much any of the unit circle values via the 45-45-90 and 30-60-90 triangles.
