Question

which of the following is known of trigonometry​

Answer 1

Answer:

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Answer 2

ǫᴜᴇsᴛɪᴏɴ →

which of the following is known of trigonometry

ᴀɴsᴡᴇʀ →

Trigonometry (from Greek trigōnon, "triangle" and metron, "measure") is a branch of mathematics that studies relationships between side lengths and angles of triangles. The field emerged in the Hellenistic world during the 3rd century BC from applications of geometry to astronomical studies. The Greeks focused on the calculation of chords, while mathematicians in India created the earliest-known tables of values for trigonometric ratios (also called trigonometric functions) such as sine.

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Formulas:

• sin²θ + cos²θ = 1.

• tan2θ + 1 = sec2θ

• cot2θ + 1 = cosec2θ

• sin 2θ = 2 sin θ cos θ

• cos 2θ = cos²θ – sin²θ

• tan 2θ = 2 tan θ / (1 – tan²θ)

• cot 2θ = (cot²θ – 1) / 2 cot θ

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