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Basis of trigonometry: if two right triangles have equal acute angles, they are similar, so their corresponding side lengths are proportional.. In mathematics, the trigonometric functions (also called circular functions, angle functions or goniometric functions) [1] are real functions which relate an angle of a right-angled triangle to ratios of two side lengths.
The energy policy of India is characterized by trade-offs between four major drivers: A rapidly growing economy, with a need for dependable and reliable supply of electricity, gas, and petroleum products; [25] Increasing household incomes, with a need for an affordable and adequate supply of electricity, and clean cooking fuels; limited ...