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Compound Angle FormulaePowerPoint Presentation

Compound Angle Formulae

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Compound Angle Formulae

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Compound Angle Formulae

Nasty Example

DC = 3, DA = 5

Write the exact value of sin DAB

LDAB = 90 + x

sin (90 + x)

sin DAB =

3

C

D

x

5

B

A

?

?

sin (90 + x)

= sin 90 cos x

+ cos90 sin x

= 1(4/5) + 0(3/5)

= 4/5

3

C

D

4

sin x = 3/5

x

5

cos x

= 4/5

B

A

√ (52 – 32)