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Simplification: sin100 ° (1 + 3tan10 °)=______ ．
Sin100 ° (1 + 3tan10 °) = sin100 ° (cos10 ° + 3sin10 °) cos10 ° = 2sin100 ° sin (30 ° + 10 °) cos10 ° = 2sin80 ° sin40 ° cos10 ° = 2sin40 °, so the answer is: 2sin40 °
How to simplify sin100 ° * cos240
=sin80°*cos120°
=-1/2sin80°
=-1/2cos10°
Simplification: √ (1-2sin10 ° cos10 °) / {cos10 ° - √ [1 - (sin100 °) ^ 2]}
Simplification: √ (1-2sin10 ° cos10 °) / {cos10 ° - √ [1 - (sin100 °) ^ 2]}
° omitted
sin10
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