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

1+cos2x ka formula || Trigonometry formula || #maths #shorttricks

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

why sin(2x)=2sin(x)cos(x)

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

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

Prove that 1 - cosx = 2sin²x/2

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

Inverse trigonometric functions : Prove that tan⁻¹ √x = 1/2 [cos⁻¹ {(1-cos x)/(1+cos x)}].

77. Límite trigonométrico: 1 - cos x entre x^2, multiplicando por conjugado | Límite

微積分学入門 - 三角法：三角関数の等式（57問中30問）証明 sin^2(x)=(1-cos2x)/2

Integral of 1/cos^2(x) (substitution)

Evaluate lim x → 0 (1 - cosx√cos2x)/x²

Evaluate: lim(x→0) (1 - cosx)/x2

【高校数学】t=tan(x/2)の置換

x が 0 に近づくときの (1-cos(x))/x^2 の極限 |微積分 1 の演習

cos 2x = 1 - 2sin^2 x

' limit x tends to 0 '1-cosx(sqrt(cos2x))/x^2' || '1-cosx(sqrt(cos2x))/x^2' ||

Prove that (sin x)^2 / (1 - cos x) = 1 + cos x

【衝撃の長さ】もはや使い所がない公式www