Question

a) 2sin de 30 grade - 3tg de 30 grade + 4cos de 60 grade=
b) sin de 45 grade - ctd de 30 grade + 2cos de 60 grade - cos de 45 grade=
c) (1+tg^2de60grade) •cos de 45 grade - sin de 45 grade• sin^2de60grade=
Tg^2 inseamna tangenta la puterea a doua
La fel si sin^2

Answer 1

a)2 x 1/2 - 3 x √3/3 + 4 x 1/2 = 
   1-√3+2=
   3-√3

b)√2/2 - √3 + 2 x 1/2 - √2/2 = 
   1-√3

c)(1 + 3) x √2/2 - √2/2 x 3/4 =
   2√2 - 3√2/8 =
   (16√2-3√2)/8=
   13√2/8

Answer 2

a) 2*1/2-3*1/√3+4*1/2=1 - 3/√3+2=3-3/√3=3-3√3/3=3 -√3
b) √2/2- √3+2*1/2 - √2/2= 1 -√3
c) [1+(√3)²]*√2/2 - √2/2*(√3/2)²=(1+3)*√2/2 -√2/2*3/4=4*√2/2 - 3√2/8=(4*4√2-3√2)/8=13√2/8