Trigonometric identity:

**1 + cot**^{2}(θ) = cosec^{2}(θ)This trigonometric identity is directly derived from sin

^{2}(θ) + cos

^{2}(θ) = 1. Consider the trigonometric identity sin

^{2}(θ) + cos

^{2}(θ) = 1. On dividing this equation by sin

^{2}(θ), we get the following equation:

In this equation:

- "sin
^{2}(θ) / sin^{2}(θ)" is equal to 1 - "cos
^{2}(θ) / sin^{2}(θ)" is equal to cot^{2}(θ) - "1 / sin
^{2}(θ)" is equal to cosec^{2}(θ)

1 + cot... which is the required identity.^{2}(θ) = cosec^{2}(θ)

Trigonometric identities applied:

- sin
^{2}(θ) + cos^{2}(θ) = 1 - cot(θ) = cos(θ) / sin(θ)
- cosec(θ) = 1 / sin(θ)

I am here to share some simple information about precalculus that is,It is a part of mathematics which prepares a student to learn and clear the basics of calculus and by learning this its simple for students to deal with calculus,It is just like a first step towards calculus.

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