MODULUS / REFERENCE
Formulas: Trigonometry
Complete Android Modulus reference: formulas for Trigonometry.
Main identities
• sin²x + cos²x = 1
• tan x = sin x / cos x
• 1 + tan²x = 1 / cos²x
Sum and difference
• sin(α ± β) = sin α cos β ± cos α sin β
• cos(α ± β) = cos α cos β ∓ sin α sin β
Double-angle formulas
• sin 2x = 2 sin x cos x
• cos 2x = cos²x − sin²x = 1 − 2 sin²x = 2 cos²x − 1
• sin²x + cos²x = 1
• tan x = sin x / cos x
• 1 + tan²x = 1 / cos²x
Sum and difference
• sin(α ± β) = sin α cos β ± cos α sin β
• cos(α ± β) = cos α cos β ∓ sin α sin β
Double-angle formulas
• sin 2x = 2 sin x cos x
• cos 2x = cos²x − sin²x = 1 − 2 sin²x = 2 cos²x − 1
Values are provided for reference. Check the required unit system and conditions before engineering or laboratory use.