Trigonometric functions for angles less than 90° Flashcards
What is sin α?
a/c or o/h
What is cos α?
b/c or a/h
What is tan α?
a/b or o/a or sin α/cos α or 1/cot α
What is cot α?
b/a or a/o or cos α/sin α or 1/tan α
What is a equal to?
csin α or btan α
What is b equal to?
ccos α or acot α
What is sine and cosine of complementary angles?
sin α = cos (90°- α), cos (90°- α) = sin α
sin (90° - α) = cos α, cos α = sin (90° - α)
What is tangens and cotangens of complementary angles?
tan (90°- α) = cot α, cot α = tan (90° - α)
cot (90° - α) = tan α, tan α = cot (90° - α)
What is the Pythagorean trigonometric identity called in swedish?
Trigonometriska ettan.
What is the Pythagorean trigonometric identity?
sin² α + cos² α = 1 for all angles α in the interval 0 < α < π/2
What is sin 30°?
½
What is sin 45°?
√2/2
What is sin 60°?
√3/2
What is cos 30°?
√3/2
What is cos 45°?
√2/2
