Trigonometric identities are trigonometric equations that are always true.
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"Trigonometry" comes from the Greek words trigonon and metron, and roughly translates to "the measurement of angles".
csc(x) = 1/sin(x) = +/- 1/sqrt(1-cos^2(x))
It is a number - in trigonometry or elsewhere.
how can trigonometry use in metallurgy
Trigonometry is used effectively in electronics.