The exact value of sin 22.5 is 0.382683432
The value of tan A is not clear from the question.However, sin A = sqrt[tan^2 A /(tan^2 A + 1)]
The exact value is 0.40673664.
sin(405) = square root of 2 divided by 2 which is about 0.7071067812
SQRT(3)/4 - 1/4
sin 480° is equal to sin 60°, which is sqrt(3)/2 or approximately 0.866.
tan u/2 = sin u/1+cos u
sin(60 degrees) = 0.8660 approx. The exact value is sqrt(3)/2.
An equation in which the variable(s) can take any value and it is still true. ex. cos(x) = cos(-x) sin(x) = -sin(-x) The above equations are true for any real value of x. Identities are sometimes written with a "triple equals sign", as in 3 parallel lines rather than 2.
An equation in which the variable(s) can take any value and it is still true. ex. cos(x) = cos(-x) sin(x) = -sin(-x) The above equations are true for any real value of x. Identities are sometimes written with a "triple equals sign", as in 3 parallel lines rather than 2.
mostly it comes from memorization. If sin 30 = 1/2, then arcsin (1/2) = 30
0.96593 (rounded)