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  2. 9 Free, Easy-To-Use Budget Templates and Spreadsheets - AOL

    www.aol.com/9-free-easy-budget-templates...

    As an added bonus, the bottom of the template includes a colorful doughnut chart that details a percentage breakdown of your monthly expenses. 6. Free Green Family Monthly Budget Template From ...

  3. Tangent half-angle formula - Wikipedia

    en.wikipedia.org/wiki/Tangent_half-angle_formula

    The tangent of half an angle is the stereographic projection of the circle through the point at angle radians onto the line through the angles .Tangent half-angle formulae include ⁡ = ⁡ ⁡ ⁡ ⁡ = ⁡ ⁡ ⁡ + ⁡ = ⁡ ⁡ ⁡ ⁡, with simpler formulae when η is known to be 0, π/2, π, or 3π/2 because sin(η) and cos(η) can be replaced by simple constants.

  4. Solution of triangles - Wikipedia

    en.wikipedia.org/wiki/Solution_of_triangles

    Solve any plane triangle problem with the minimum of input data. Drawing of the solved triangle. TriSph – Free software to solve the spherical triangles, configurable to different practical applications and configured for gnomonic. Spherical Triangle Calculator – Solves spherical triangles. TrianCal – Triangles solver by Jesus S.

  5. Small-angle approximation - Wikipedia

    en.wikipedia.org/wiki/Small-angle_approximation

    For a small angle, H and A are almost the same length, and therefore cos θ is nearly 1. The segment d (in red to the right) is the difference between the lengths of the hypotenuse, H, and the adjacent side, A, and has length , which for small angles is approximately equal to /.

  6. Tangent half-angle substitution - Wikipedia

    en.wikipedia.org/wiki/Tangent_half-angle...

    As t goes from 0 to 1, the point follows the part of the circle in the first quadrant from (1, 0) to (0, 1). Finally, as t goes from 1 to +∞, the point follows the part of the circle in the second quadrant from (0, 1) to (−1, 0). Here is another geometric point of view. Draw the unit circle, and let P be the point (−1, 0).

  7. List of formulae involving π - Wikipedia

    en.wikipedia.org/wiki/List_of_formulae_involving_π

    where C is the circumference of a circle, d is the diameter, and r is the radius.More generally, = where L and w are, respectively, the perimeter and the width of any curve of constant width.

  8. List of trigonometric identities - Wikipedia

    en.wikipedia.org/wiki/List_of_trigonometric...

    A formula for computing the trigonometric identities for the one-third angle exists, but it requires finding the zeroes of the cubic equation 4x 3 − 3x + d = 0, where is the value of the cosine function at the one-third angle and d is the known value of the cosine function at the full angle.

  9. Mnemonics in trigonometry - Wikipedia

    en.wikipedia.org/wiki/Mnemonics_in_trigonometry

    Signs of trigonometric functions in each quadrant. All Students Take Calculus is a mnemonic for the sign of each trigonometric functions in each quadrant of the plane. The letters ASTC signify which of the trigonometric functions are positive, starting in the top right 1st quadrant and moving counterclockwise through quadrants 2 to 4.