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Trigonometry
New post in Trigonometry
Cotangent summation (proof)
January 11th, 2020
complex-numbers
summation
trigonometry
Deriving power series for $\sin x$ without using Taylor's Theorem or $\exp z$
August 1st, 2022
calculus
power-series
trigonometry
Where are secant, cosecant, and cotangent applied?
October 12th, 2020
trigonometry
rational angles with sines expressible with radicals
August 1st, 2022
trigonometry
polynomials
algebraic-number-theory
irrational-numbers
Trying to get the infinite product for $\sin x$
September 1st, 2022
trigonometry
Why Are Sine and Cosine Called Harmonic Functions
August 1st, 2022
calculus
multivariable-calculus
trigonometry
definition
Elegant Trigonometric Sums
August 1st, 2022
trigonometry
Distance between incentre and orthocentre.
August 1st, 2022
geometry
euclidean-geometry
triangles
trigonometry
$\sin(2\arccos(x))$, please help me understand how to do these kind of problems.
August 25th, 2022
trigonometry
Proving a trig identity: $\frac{\sin(A + B)}{\sin(A - B)}=\frac{\tan A + \tan B}{\tan A - \tan B}$
August 4th, 2020
trigonometry
How to prove a trigonometric identity $\tan(A)=\frac{\sin2A}{1+\cos 2A}$
August 15th, 2022
trigonometry
How to calculate the sine manually, without any rules, calculator or anything else?
August 1st, 2022
algorithms
trigonometry
$\tan(\pi/2)$ is undefined but $\cot(\pi/2)$ is defined
August 3rd, 2022
trigonometry
calculus
Integration substitution: How does Wolfram Alpha come up with this step?
August 1st, 2022
integration
trigonometry
wolfram-alpha
analysis
Trigonometry Identity: Prove that $\sin(a-b)=\sin a \cos b - \cos a \sin b$
August 1st, 2022
trigonometry
proof-writing
How to turn this sum into an integral?
May 26th, 2020
calculus
sequences-and-series
trigonometry
limits
circles
How similar are circular and parabolic paths?
August 1st, 2022
trigonometry
circles
parametric
Solving $\cos x+\sin x-1=0$
August 25th, 2022
trigonometry
Does $\operatorname{arcsec}(x) = 1 /\arccos(x)$?
September 1st, 2022
algebra-precalculus
trigonometry
A limit without invoking L'Hopital: $\lim_{x \to 0} \frac{x \cos x - \sin x}{x^2}$
August 1st, 2022
trigonometry
calculus
real-analysis
limits-without-lhopital
Is $\sin^3 x=\frac{3}{4}\sin x - \frac{1}{4}\sin 3x$?
August 8th, 2022
trigonometry
Prove $\sin(-x) = -\sin(x)$
August 1st, 2022
trigonometry
Prove trig identity: $(\sin \theta + 1)(\sin \theta − 1) = −\cos^2 θ$
August 9th, 2022
trigonometry
Prove $\cos 3x =4\cos^3x-3\cos x$
August 10th, 2022
trigonometry
Orthogonal Projection Area of a 3-d Cube
August 1st, 2022
projective-geometry
trigonometry
geometry
Trigonometrical limit $\lim\limits_{ x\to 0 } \frac{\sin x - x\cos x}{x^3}?$
August 1st, 2022
calculus
trigonometry
limits-without-lhopital
limits
Summing $ \sum _{k=1}^{n} k\cos(k\theta) $ and $ \sum _{k=1}^{n} k\sin(k\theta) $
August 5th, 2022
trigonometry
complex-numbers
Proof that $\int_0^{2\pi}\sin nx\,dx=\int_0^{2\pi}\cos nx\,dx=0$
August 1st, 2022
integration
trigonometry
definite-integrals
induction
$\cos x+\cos 3x+\cos 5x+\cos 7x=0$, Any quick methods?
September 17th, 2020
trigonometry
What is the most efficient way to calculate the sine of a rational number?
August 1st, 2022
computational-mathematics
trigonometry
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