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sin
2
(
x
)
+
cos
2
(
x
)
=
1
{\displaystyle \sin ^{2}(x)+\cos ^{2}(x)=1}
1
+
tan
2
(
x
)
=
sec
2
(
x
)
{\displaystyle 1+\tan ^{2}(x)=\sec ^{2}(x)}
1
+
cot
2
(
x
)
=
csc
2
(
x
)
{\displaystyle 1+\cot ^{2}(x)=\csc ^{2}(x)}
