oblicz 2(tg30 - sin45)*(cos45 + cos30) = (tg 60 - sin 30) × (cos 60 - ctg 30) =

oblicz 2(tg30 - sin45)*(cos45 + cos30) = = 2*(⅓*√3 - ½√2)*(½*√2 + (½*√3) = = 2*(⅓*½*√3*√2 + ⅓*½*√3*√3 - ½*½*√2*√2 - ½*½*√2*√3) = = 2*(1/6*√6 + 1/6*3 - ¼*2  -¼*√6) = = 2*(1/6*√6 + ½ - ½ - ¼√6) = = 2*(1/6√6 - ¼√6) = = 2(2/12√6 - 3/12√6) = 2*(- 1/12)*√6 = = (-1/6)*√6       (tg 60 - sin 30) × (cos 60 - ctg 30) = = (√3 - ½)*(½ - √3) = = -(½ -√3)(½ -√3) = = - (½-√3)² = = - [(½)² - 2*½*√3 + (√3)²] = = - [ ¼ - √3 + 3 ] = = - [ 3¼  - √3 ] = = - 3¼ + √3 = =   √3 - 3¼