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Complex Numbers — MATHS STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceMATHSComplex Numbers1 Mark
MCQ
$\cosh (\alpha +i\beta )-\cosh (\alpha -i\beta )$ is equal to [RPET 2000]
  • A
    $2\,\,\sinh \,\alpha \,\,\sinh \,\beta $
  • B
    $2\,\,\cosh \,\alpha \,\,\cosh \,\beta $
  • ✓
    $2i\,\,\sinh \,\alpha \,\,\sin \,\beta $
  • D
    $2\,\,\cosh \,\alpha \,\,\cos \,\beta $
✓

Answer

Correct option: C.
$2i\,\,\sinh \,\alpha \,\,\sin \,\beta $
C

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