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Trigonometrical Identities — Mathematics STD 10 — Question

ICSE BoardEnglish MediumSTD 10MathematicsTrigonometrical Identities1 Mark
MCQ
$\left(\sec ^2 \theta-1\right)\left(1-\operatorname{cosec}^2 \theta\right)$ is equal to:
  • A
    -1
  • B
    $\cot \theta$
  • C
    0
  • D
    $\operatorname{cosec} \theta$
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Answer

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