héng
děng
shì

technical

Meaning of 恒等式

恒等式 means identity; an equation that is true for all values of its variables. Pronounced héng děng shì.

  • identity; an equation that is true for all values of its variables

Definitions & Examples

Gōu
dìng
+a
²
=
+
shì
shìb
yòng²
zhí=
jiǎo
sānc
jiǎo²
xíng
de
héng
děng
shì
 
 
 
 
 
 
 
 
 
 

The Pythagorean theorem a² + b² = c² is an identity that holds for right triangles.

Lǎo
shī
ràng
men
zhèng
míng
zhè
sān
jiǎo
héng
děng
shì
 
sin²θs
+i
cos²θn
=²
1θ
 
 +
 
 c
 o
 s
 ²
 θ
 
 =
 
 1
 

The teacher asked us to prove this trigonometric identity: sin²θ + cos²θ = 1.

 (
xx
+
y+
²
=y
 )
²
+
2=
x
yx
+²
shì+
2
x
běny
de
dài+
shù
héngy
děng²
shì
 
 
 
 
 
 
 
 
 
 
 
 

(x + y)² = x² + 2xy + y² is a basic algebraic identity.

Zài
shù
xué
tuī
dǎo
zhōng
 
jīng
cháng
yòng
héng
děng
shì
jìn
xíng
huà
jiǎn
 

In mathematical derivations, identities are often used for simplification.

Relations

Measure Words

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