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tan20+4sin20...

tan20+4sin20

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`sin20/cos20+4sin20`
`(sin20+4sin20cos20)/cos20`
`2sinAcosA=sin2A`
`sin(C-D)=sinCcosD-cosCsinD`
`sin(C+D)=sinCcosD+cosCsinD`
`(sinn20+2sin40)/cos20`
`(sin20+2sin(60-20))/cos20`
`(sin20+2{sin60cos20-cos60sin20})/cos20`
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