જો $\sin \theta_1 + \sin \theta_2 + \sin \theta_3 = 3$ હોય,તો $\cos \theta_1 + \cos \theta_2 + \cos \theta_3 =$

  • A
    $3$
  • B
    $2$
  • C
    $1$
  • D
    $0$

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વિધેય $f(x) = 3\sin x + 4\cos x$ નું મહત્તમ મૂલ્ય કેટલું છે?

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