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Compound Angle Formulae

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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  1. Compound Angle Formulae Nasty Example

  2. 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

  3. ? ? 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)

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