Pythagorean identities - University of Washington
1. Pythagorean identities
sin2 x + cos2 x = 1
1 + tan2 x = sec2 x
2. Sum-Difference formulas
sin(x ¡À y) = sin x cos y ¡À sin y cos x
cos(x ¡À y) = cos x cos y ? sin x sin y
tan(x ¡À y) =
tan x¡Àtan y
1?tan x tan y
cot(x ¡À y) =
¦Á¡À¦Â
arctan(¦Á) ¡À arctan(¦Â) = arctan 1?¦Á¦Â
cot x cot y?1
cot x¡Àcot y
3. Double Angle formulas
sin 2x = 2 sin x cos x
cos 2x = cos2 x ? sin2 x = 2 cos2 x ? 1 = 1 ? 2 sin2 x
tan 2x =
2 tan x
1?tan2 x
4. Half Angle formulas
sin2 x =
1?cos(2x)
2
cos2 x =
1+cos(2x)
2
tan2 x =
1?cos(2x)
1+cos(2x)
5. Sum to product formulas
sin x+sin y = 2 sin( x+y
) cos( x?y
)
2
2
sin x?sin y = 2 cos( x+y
) sin( x?y
)
2
2
) cos( x?y
)
cos x+cos y = 2 cos( x+y
2
2
cos x?cos y = ?2 sin( x+y
) sin( x?y
)
2
2
6. Product to sums formulas
sin x sin y = 21 (cos(x ? y) ? cos(x + y))
cos x cos y = 21 (cos(x ? y) + cos(x + y))
sin x cos y = 21 (sin(x + y) + sin(x ? y))
7. Another useful trick
¡Ì
A sin x + B cos x = A2 + B 2 sin(x + ¦Á), where ¦Á = arccos ¡ÌA2A+B 2
1
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