tan200(cot10-tan10)

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1. tan200(cot10-tan10)
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2. Solve without the use of a calculator:sin20(tan10+cot10) I know it should equal two but I don't know how to get there
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3. prove: tan10+tan70+tan100=tan10.tan70.tan100
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4. Tan100+4sin100=?As tan(90+10)+4sin(90+10) -cot10+4cos10 Aftr that i don't know what to do
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