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  2. Law of sines - Wikipedia

    en.wikipedia.org/wiki/Law_of_sines

    In trigonometry, the law of sines, sine law, sine formula, or sine rule is an equation relating the lengths of the sides of any triangle to the sines of its angles. According to the law, ⁡ = ⁡ = ⁡ =, where a, b, and c are the lengths of the sides of a triangle, and α, β, and γ are the opposite angles (see figure 2), while R is the radius of the triangle's circumcircle.

  3. List of trigonometric identities - Wikipedia

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

    The half-angle formula for sine can be obtained by replacing with / and taking the square-root of both sides: ⁡ (/) = (⁡) /. Note that this figure also illustrates, in the vertical line segment E B ¯ {\displaystyle {\overline {EB}}} , that sin ⁡ 2 θ = 2 sin ⁡ θ cos ⁡ θ {\displaystyle \sin 2\theta =2\sin \theta \cos \theta } .

  4. Trigonometry - Wikipedia

    en.wikipedia.org/wiki/Trigonometry

    The law of sines (also known as the "sine rule") for an arbitrary triangle states: [85] ⁡ = ⁡ = ⁡ = =, where is the area of the triangle and R is the radius of the circumscribed circle of the triangle:

  5. Proofs of trigonometric identities - Wikipedia

    en.wikipedia.org/wiki/Proofs_of_trigonometric...

    Illustration of the sine and tangent inequalities. The figure at the right shows a sector of a circle with radius 1. The sector is θ/(2 π) of the whole circle, so its area is θ/2. We assume here that θ < π /2. = = = ⁡ = ⁡

  6. Spherical trigonometry - Wikipedia

    en.wikipedia.org/wiki/Spherical_trigonometry

    The sine rule gives C and then we have Case 7. There are either one or two solutions. Case 4: two angles and an included side given (ASA). The four-part cotangent formulae for sets (cBaC) and (BaCb) give c and b, then A follows from the sine rule. Case 5: two angles and an opposite side given (AAS). The sine rule gives b and then we have Case 7 ...

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    A man is igniting viral conversation after sharing that he wants to plan a trip with his longtime female friend — and doesn't want his wife tagging along.

  8. No. 6 Florida focused amid unbeaten start, ready for Stetson

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    Richard's 14 points per game rank third on the Gators behind fellow guards Walter Clayton Jr. (17.6) and Alijah Martin (14.9). Sunday's contest against the Hatters (2-10) will be Florida's last ...

  9. Additional Mathematics - Wikipedia

    en.wikipedia.org/wiki/Additional_Mathematics

    9.1 Sine Rule; 9.2 Cosine Rule; 9.3 Area of Triangles; 9.4 Application of Sine Rule, Cosine Rule and Area of a Triangles; 10) Index Numbers 10.1 Index Number; 10.2 Composite Index; Form 5 1) Circular Measure 1.1 Radian; 1.2 Arc Length of a Circle; 1.3 Area of Sector of a Circle; 1.4 Application of Circular Measure; 2) Differentiation

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