How on earth is 1-cos(x) equal to 2sin^2(x/2)?

1-cosx = 2sin^2(x/2) trigonometric identites proof || 1-cos theta

Prove that 1+cosx=2cos^2(x/2) and 1-cosx=2sin^2(x/2) trigonometric identites

PreCalculus - Trigonometry: Trig Identities (30 of 57) Proof sin^2(x)=(1-cos2x)/2

1+cosx=2cos^2(x/2) trigonometry identites solve || 1+cos(theta)

PreCalculus - Trigonometry: Trig Identities (31 of 57) Proof cos^2(x)=(1+cos2x)/2

Prove that 1 - cosx = 2sin²x/2

Evaluate: lim(x→0) (1 - cosx)/x2

Chain rule question.live-3

Limit (1 - cosx)/x^2 At times L'Hospital's Rule may not be applied

#Trigonometry all formulas

Integral 1/cos^2(x)

1 - cos x = 2sin^2(x/2)

prove sinx/(1+cosx)=tan(x/2)

Limit of (1-cos(x))/x as x approaches 0 | Derivative rules | AP Calculus AB | Khan Academy

Verify the Trig Identity (1 + cos(x))/sin(x) = csc(x) + cot(x)

cscx cotx^2=1 cosx,1+cosx Verifying Trigonometric Identities, How to Verify Trig Identities

(1 - cosx)/(1 + cos x) = (csc x - cot x)^2

How REAL Men Integrate Functions

`int(1-cosx)cosec^(2)x dx` is equal to