If cot⁴θ + cot²θ = 2.2, then csc⁴θ − csc²θ = ?

Question

Accepted Answer

C. 2.2

1. Use csc²θ = 1 + cot²θ.
2. csc⁴θ − csc²θ = csc²θ(csc²θ − 1) = (1 + cot²θ)(cot²θ).
3. Expanding: cot²θ + cot⁴θ = cot⁴θ + cot²θ = 2.2.
_Source: RRB Group D CEN-02/2018 PYQ, Q.10._

Answer

0

Answer

1.1

Answer

3.3

If cot⁴θ + cot²θ = 2.2, then csc⁴θ − csc²θ = ?

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