arctan(1) = arctan(1/2) + arctan(1/3) = π/4 - Euler Formula - Quick Geometric Solution
An arctan problem
Evaluating Inverse Trigonometric Functions
単位円を用いた逆三角関数(arcsin、arccos、arctan)の評価
Arctan(x)+arctan(1/x)=pi/2
Trig Visualized: One Diagram to Rule them All (six trig functions in one diagram)
Power series for inverse tangent with Maclaurin formula vs. computer, and an infinite series for pi.
Power series for inverse tangent using a geometric series and infinite series for pi.
The only Proof you need to watch for arctan(x) + arctan(y)
Sum of Inverse Tangents || High School Math
Find the Exact Value of the Inverse Tangent of (a) One & (b) Negative One
Inverse Trig Identity: arctan(x) + arccot(x) = π/2
Inverse Trigonometric Functions and Right Triangles
Simplify the expression tan(sin^(-1) x). Inverse Trig Functions
Other Inverse Trigonometric Functions
The Most Unhinged Pi Approximation there Ever Was
INVERSE TRIGONOMETRIC FUNCTIONS @BEINGHUSTLERS
Find the exact value of arccot of negative 1
P3 arcsinx, arccosx, arctan [Derivation]
【積分#2】1/(x²+1)・arctan{√3/(2x²+1)}を積分せよ!【難易度★★★★★★★★☆☆】