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sin(x) can be rewritten as…
1/csc(x)
cos(x) can be rewritten as…
1/sec(x)
tan(x) can be rewritten as…(two answers)
sin(x)/cos(x) OR 1/cot(x)
csc(x) can be rewritten as…
1/sin(x)
sec(x) can be rewritten as…
1/cos(x)
cot(x) can be rewritten as…(two answers)
cos(x)/sin(x) OR 1/tan(x)
The basic pythagorean identity is…
sin²(x) + cos²(x) = 1
sin²(x) can be rewritten as…
1 - cos²(x)
cos²(x) can be rewritten as…
1 - sin²(x)
sec²(x) can be rewritten as…
tan²(x) + 1
tan²(x) can be rewritten as…
sec²(x) - 1
csc²(x) can be rewritten as…
cot²(x) + 1
cot²(x) can be rewritten as…
csc²(x) - 1
cos(A+B) can be rewritten as…
cosAcosB - sinAsinB
cos(A-B) can be rewritten as…
cosAcosB + sinAsinB
sin(A+B) can be rewritten as…
sinAcosB + cosAsinB
sin(A-B) can be rewritten as…
sinAcosB - cosAsinB
for a cosine sum and difference identity, the sign…
changes
for a sine sum and difference identity, the sign
stays the same
sin(2x) can be rewritten as…
2sin(x)cos(x)
cos(2x) can be rewritten as…(3 answers)
cos²(x)-sin²(x), 1 - 2sin²(x), OR 2cos²(x) - 1
Note 
Flashcard (21)