Theory OF Sine Rule || Cosine Rule || Projection formula

Rules

Basic||Sine rule|| Cosine rule||Projection formula||Tangent rule || Napier Analogy

Illustrations Based upon Sine || Cosine Rule and Projection Formula

Real definition OF sine || Cosine || Reduction formula

Questions based on Cosine formula || Projection formula & Illustration

Sine And Cosine Rule For Triangels

Sine law|Cosine law|Tangent law|Projection law|Questions based on sine law|Cosine law|Tangent law|Projection law

Triangle (त्रिभुज)|Sine Rule (ज्या नियम)|Questions (प्रश्न)|Cosine Rule (कोज्या नियम)|Projection Formulae (प्रक्षेप सूत्र)|Trigonometrical Ratios Of Half Angles Of A Triangle (एक त्रिभुज अर्द्ध कोणों का त्रिकोणीय अनुपात)|Some Other Formulae (कुछ अन्य नियम

Using the sine rule , prove the cosine rule.

Sine formula proof : Sine Rule