Trigonometry Flashcards

1
Q

Reciprocal trigonometric functions

A

1 / sin(x) = cosec(x)
1 / cos(x) = sec(x)
1 / tan(x) = cot(x)

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2
Q

Compound angle formula

A

Given in formula sheet

Note:
sin( 45º + 60º) ≠ sin(45º) + sin(60º)

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3
Q

Double angle formula

A

Given in formula sheet

Note:
sin(2A) ≠ 2sin(A)

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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

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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

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