Тригон

sin^2(x)+cos^2(a)=?

• 1

• 0

• tg^2(a)

• ctg'2(a)

tgx*ctgx=

• 0

• sinx/cosx

• 1

• -1

1+tg^2(x)=

• 0

• 1/sin^2(x)

• 1-ctg^2(x)

• 1/cos^2(x)

3sina-4sin^3(a)

4cos^3(a)-3cosa

1-cosa=

• 2sin^2(pi-a/2)

• sin^2(a)

• 1-cos(a)+1
• 2sin^2(a/2)

cos2a=

• cos^2(a) - sin^2(a)
• 1-2sin^2(a)

• cos(a) * sin(a)
• 2cos^2(a)-1

cos2a

• 2cos^2(a) - 1
• 1-2sin^2(a)

• 2cos(a) - 1
• cos^2(2a) - 1

sin^2(a)

• (1-cos2a)/2

• cos^2(a)-cos2a

• sin(a)
• 1/2(1+cos2a)

cos2a

• 2cos^2(a)-1

• 2/ctga-tga

• 1-2sin^2(a)

• cos(a) / sin(a)