高一数学三角函数化简为题√[(sin^2 α)(1+cotα)+(cos^2 α)(1+tanα)]

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高一数学三角函数化简为题√[(sin^2α)(1+cotα)+(cos^2α)(1+tanα)]高一数学三角函数化简为题√[(sin^2α)(1+cotα)+(cos^2α)(1+tanα)]高一数学

高一数学三角函数化简为题√[(sin^2 α)(1+cotα)+(cos^2 α)(1+tanα)]
高一数学三角函数化简为题
√[(sin^2 α)(1+cotα)+(cos^2 α)(1+tanα)]

高一数学三角函数化简为题√[(sin^2 α)(1+cotα)+(cos^2 α)(1+tanα)]
√[(sin^2 α)(1+cotα)+(cos^2 α)(1+tanα)]
=√[(sin)^2+sinacosa+sinacosa+(cosa)^2]
=√(sina+cosa)^2
=|sina+cosa|

sin^2α/(1+cotα)+cos^2α/(1+tanα)
=sin^2α·sinα/(sinα+cosα)+cos^2α·cosα/(cosα+sinα)
=(sin^3α+cos^3α)/(sinα+cosα)
=(sinα+cosα)(sin^2α-sinα·cosα+cos^2α)/(sinα+cosα)
=sin^2α-sinα·cosα+cos^2α
=1-sinαcosα

将切化成弦
√[(sin^2 α)(1+cotα)+(cos^2 α)(1+tanα)]
=√[sinα(sinα+cosα)+cosα(cosα+sinα)]
=√(sinα+cosα)^2
=|sinα+cosα|