oblicz wartosc wyrażenia:  1. (cos45`-cos30`) x (cos45`=cos30`) 2. 18 x sin30` x tg30` x (cos30` x tg60`) 3. 4 x cos60` x sin30` - cos30` x sin60` 4. 2x(tg30` - sin45` x (cos45` - tg60`)

1)  = ( cos^2 45 st - cos^2 30 st = [ p(2)/ 2]^2 - [ p(3)/2]^2 = 1/2 - 3/4 = 2/4 - 3/4 = - 1/4 2) = 18* (1/2) * [ p(3)/ 3] * [ p(3)/ 2]*[ p(3)] = 9* (3/6) *p(3) = 4,5 p(3) 3) = 4* (1/2)*(1/2) -  [ p(3)/ 2]*[ p(3)/ 2] = 1 -  3/4 = 1/4 3)  = 2*(  p(3)/ 3 - p(2)/ 2) * (  p(2)/ 2 - p(3)) =( ( 2/3)p(3) - p(2) )*(  p(2) / 2 - p(3)) = =  itd