કિંમત શોધો:
$\cos 48^{\circ}-\sin 42^{\circ}$

  • A
    $0$
  • B
    $1$
  • C
    $-1$
  • D
    $0.5$

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સાબિત કરો કે $\sec A(1-\sin A)(\sec A+\tan A)=1$.

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નીચેનાનું મૂલ્ય શોધો:
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