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Find the value of 3Sin2 20® …

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Find the value of 3Sin2 20® - 2Tan2 45® + 2Sin2 70®

    • Posted by Koushik Ch 5 years, 9 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Yogita Ingle 5 years, 9 months ago

    3sin²20°-2tan²45°+2sin²70°
    =3sin²20°-2×(tan45°)²+2{sin(90°×1)-20°}²
    =3sin²20°-2×(1)²+2cos²20°
    =3sin²20°+ 2cos²20°

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