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Sin 40 degree - cos 70 …

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Sin 40 degree - cos 70 degree = √3. Cos 80 degree

    • Posted by Angel Khan 5 years, 6 months ago

    CBSE > Class 11 > Mathematics
    • 1 answers

    Prakhar Dixit 5 years, 6 months ago

    Sin40-cos70 =Sin40-cos(90-20) =Sin40-sin20 =2cos40+20/2×sin40-20/2 =2cos60/2×sin20/2 =2×√3/2×sin10 =√3sin(90-80) √3cos10

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