यदि $2\cos^2 \theta - 2\sin^2 \theta = 1$ है,तो $\theta = \dots ^\circ$.

  • A
    $15$
  • B
    $30$
  • C
    $45$
  • D
    $60$

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यदि $\cos ^3 x \sin 4 x = \sum_{r=0}^{n} a_{r} \sin rx$ सभी $x \in R$ के लिए है,तो $a_3+a_5 : a_1+a_7 = $

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