Trigonometry, find sum of squared sines, given some tangent sum
47356
If : $\tan^2\alpha \tan^2\beta +\tan^2\beta \tan^2\gamma + \tan^2\gamma \tan^2\alpha + 2\tan^2\alpha \tan^2\beta \tan^2\gamma =1\dots$
67988
Trigonometric curiosity
1210
Write an expression for $(\cos θ + i\sin θ)^4$ using De Moivre’s Theorem.
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Summation of a trigonometric series - $\frac{\sin n}{n}$
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Solve simple trig equation
95739
Sum of tangent functions where arguments are in specific arithmetic series
29604
How to solve $\sin x +\cos x = 1$?
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How to sum $\sum_{x=0}^{N-1} \cos{\left( \frac{2\pi x}{N} \right)}^{2}$?
147113
How to solve $2 \tan x / (1 - (\tan x)^2) = (\sin 2x)^2$?
89319
How can I find all the solutions of $\sin^5x+\cos^3x=1$
154231
Solving trigonometric equations without a calculator or tables
49028
Find the sum : $\frac{1}{\cos0^\circ\cos1^\circ}+\frac{1}{\cos1^\circ \cos2^\circ} +\frac{1}{\cos2^\circ \cos3^\circ}+......+$
125597
calculator's angle answer for trig ratios that can work in more than 1 quadrant on the unit circle
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Trigonometry Olympiad Question
6634
Evaluate trigonometric function
83332
Trig sum: $\tan ^21^\circ+\tan ^22^\circ+\cdots+\tan^2 89^\circ = \text{?}$
77810
Solving Trigonometric Derivatives