Trigonometric Formulae Flashcards

1
Q

The identity involving tan2x:

A
  • Tan2x = sec2x -1
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2
Q

What are the 3 formulae for cos2x (double angle)

A
  1. Cos2x - sin2x
  2. 1 - 2sin2x
  3. 2cos^2x - 1
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3
Q

Double angle formula for sin2x

A
  • 2sinxcosx
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4
Q

Double angle formula for tan2x

A

2tanx / (1 - tan2x)

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5
Q

The identity involving cot^2x and cosec^2x

A
  • Cosec2x = 1 + cot2x
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6
Q

What is cosec(x)

A

1/sin(x)

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7
Q

What is sec(x)

A

1/cos(x)

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8
Q

What is cot(x)

A

1/tan(x)

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