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Introduction of Trigonometry — Maths STD 10 — Question

CBSE BoardEnglish MediumSTD 10MathsIntroduction of Trigonometry1 Mark
MCQ
The value of $\cos^217^\circ-\sin^273^\circ$ is :
  • A
    $1$
  • B
    $\frac{1}{3}$
  • ✓
    $0$
  • D
    $-1$
✓

Answer

Correct option: C.
$0$
We have :
$= \cos^217^\circ-\sin^273^\circ$
$= \cos^2(90^\circ-73^\circ)-\sin^273^\circ$
$= \sin^273^\circ-\sin^273^\circ$
$= 0$
Hence the correct option is $(c)$

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