(sin 20/cos 20)^2+ ( cos 62 / sin 28)- sin^2 30

Dear student
sin20°cos20°2+cos62°sin28°-sin230°=sin20°cos20°2+sin90°-62°sin28°-122    cosx=sin90°-x=sin20°cos20°2+sin28°sin28°-14     =sin20°cos20°2+1-14=tan220°+34
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