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(sin ά – cos ά)² + 4tg β =(sin 30⁰– cos 30⁰)² + 4 tg 45⁰=
(1/2– √3/2)² + 4 *1=
1/4 – √3/2+3/4 + 4 =
– √3/2 + 5
1- 2sinαcosα +4tgβ= 1- sin2α + 4tgβ= 1 - √3/2 +4 = 5-√3