sin19°×cos71°+cos19°×sin71°
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Answer:
sin19° × cos71° + cos19° × sin71°
sin19° × cos(90° - 19°) + cos19° × sin(90° - 19°)
sin19° × sin19° + cos19° × cos19° [cos(90-x) =
sinx & sin(90°-x) =
cosx]
sin^2 19° + cos^2 19°
= 1
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