化简根号(1-sin^2 170)

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化简根号(1-sin^2170)化简根号(1-sin^2170)化简根号(1-sin^2170)√(1-(sin170)^2)=√cos(170)^2=cos10or-cos101-sin^2170=

化简根号(1-sin^2 170)
化简根号(1-sin^2 170)

化简根号(1-sin^2 170)
√(1-(sin170)^2)
=√cos(170)^2
=cos10 or -cos10

1-sin^2 170=cos^2 170
又∵cos 170<0
∴根号1-sin^2 170
=根号cos^2 170
=-cos 170
=cos 10

√(1-sin²170°)
=√cos²170°
=√cos²(180°-10°)
=√(-cos10°)²
=√cos²10°
=cos10°