Oblicz:a)4cos60' * sin30'-cos30'*sin60'=b)ctg30'*ctg45':(ctg60'*tg45')=c)(cos45'-cos30')*(cos45'+cos30')=
a)4cos60' * sin30'-cos30'*sin60'=4*1/2*1/2-√3/2*√3/2=1-3/4=1/4
b)ctg30'*ctg45':(ctg60'*tg45')=√3*1/(√3/3*1)=3
c)(cos45'-cos30')*(cos45'+cos30')=(√2/2-√3/2)(√2/2+√3/2)=2/4-3/4=-1/4
a)4cos60' * sin30'-cos30'*sin60'=
4*½*½-√3/2*√3/2 = 1- ³/₄ = ¼
b)ctg30'*ctg45':(ctg60'*tg45')=
√3*1:(√3/3*1) = √3:√3/3 = 3
c)(cos45'-cos30')*(cos45'+cos30')=
(cos45')²-(cos30)²=
(√2/2)² - (√3/2)²= ²/₄- ³/₄= -¼
" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2025 KUDO.TIPS - All rights reserved.
a)4cos60' * sin30'-cos30'*sin60'=4*1/2*1/2-√3/2*√3/2=1-3/4=1/4
b)ctg30'*ctg45':(ctg60'*tg45')=√3*1/(√3/3*1)=3
c)(cos45'-cos30')*(cos45'+cos30')=(√2/2-√3/2)(√2/2+√3/2)=2/4-3/4=-1/4
a)4cos60' * sin30'-cos30'*sin60'=
4*½*½-√3/2*√3/2 = 1- ³/₄ = ¼
b)ctg30'*ctg45':(ctg60'*tg45')=
√3*1:(√3/3*1) = √3:√3/3 = 3
c)(cos45'-cos30')*(cos45'+cos30')=
(cos45')²-(cos30)²=
(√2/2)² - (√3/2)²= ²/₄- ³/₄= -¼