What is 15 What is 15 degrees

What is 15 What is 15 degrees

(radical 6-radical 2) / 4
With an acute angle of 30 degrees right triangle can be pushed out.. specific you want to process me

If sin α = - 1 / 3 and α is the third quadrant angle, then cos α=______ ,tanα=________ If cos α = 12 / 13 and α is the fourth quadrant angle, then sin α=______ ,tanα=________ If we know that Tan α = - 3 and α is the second quadrant angle, then sin α=_______ cosα=______ Given cos θ = 3 / 5, find sin α, Tan α -------- (the main process of this problem) given sin (π - α) = log_ 8 (1 / 4), and α∈ (- π / 2,0), then cot (2 π - α)=_________ Ask God to solve the fourth problem, thanks

1,tanα=1/3
sin²α=sin²α/(sin²α+cos²α)
The numerator and denominator are divided by cos & # 178; α
sin²α=tan²α/(tan²α+1)=(1/9)/(1+1/9)=1/10
α is the third quadrant angle, sin α

Given Tan (tt / 4 + a) = 1 / 2, find the value of (sin 2A - cos ^ 2a) / (1 + cos 2a)

tan(TT/4+a)=1/2(tana+1)/(1-tana)=1/21-tana=2tana+23tana=-1tana=-1/3(sin 2a -cos^2 a)/(1+cos 2a)=(2sinacosa -cos²a)/(sin²a+cos²a+cos²a-sin²a)=tana-1/2=-1/3-1/2=-5/6

Let's know the terminal point P (- 4,3) of angle A. find cos (tt / 2 + a) - sin (tt-a) / cos (a-7tt) + cos (9tt / 2-A)

【cos(π/2+a)sin(-π-a)】/【cos(11π/2-a)sin(9π/2+a)】
=【(-sina)sina】/【(-sina)(-cosa)】
=-tana
=3/4