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Who invented trigonometry and how could they justify it?
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"Development of Trigonometry is not the work of any one man or nation. Its history spans thousands of years and has touched every major civilization. It first originated in India and the basic concepts of angle and measurements have been noted in Vedic texts such as Srimad Bhagavatam.2 However, trigonometry in its present form was established in Surya-siddhanta and later by Aryabhata 5th century CE. It should be noted that from the time of Hipparchus until modern times there was no such thing as a trigonometric ratio. Instead, the Indian civilization and after them the Greeks and the Muslims used trigonometric lines. These lines first took the form of chords and later half chords, or sines. These chord and sine lines would then be associated with numerical values, possibly approximations, and listed in trigonometric tables"
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