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8. Trigonometric Identities
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Q7 of 186 Page 350

sin 47° cos 43° + cos 47° sin 43° = ?

Consider (sin 47° cos 43°) + (cos 47° sin 43°)

= (sin 47° cos (90 – 47)°) + (cos 47° sin (90 – 47)°)


= sin2 47° + cos2 47°


= 1

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Questions · 186
8. Trigonometric Identities
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