Trigonometry Flashcards
1
Q
Reciprocal trigonometric functions
A
1 / sin(x) = cosec(x)
1 / cos(x) = sec(x)
1 / tan(x) = cot(x)
2
Q
Compound angle formula
A
Given in formula sheet
Note:
sin( 45º + 60º) ≠ sin(45º) + sin(60º)
3
Q
Double angle formula
A
Given in formula sheet
Note:
sin(2A) ≠ 2sin(A)
4
Q
Values of R and a
For the form: a sin(x) + b cos(x)
A
2sin(x) - 3sin(x) = Rsin(x - a)
= Rsin(x)cos(a) - Rcos(x)sin(a)
Use pythagoras to solve for R and a
Put in specified form
5
Q
Answers out of range
A
draw graph and figure out where answers lie
cos = 360 - answer
tan = 180 + answer
sin = 180 - answer or 360 + answer