# Compound Angle Formulae - PowerPoint PPT Presentation

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Compound Angle Formulae. Nasty Example. DC = 3, DA = 5. Write the exact value of sin DAB. L DAB = 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.

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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)