જો ${\sin ^3}x \sin 3x = \sum\limits_{m = 0}^n {{c_m} \cos mx} $ હોય,જ્યાં ${c_0}, {c_1}, {c_2}, \dots, {c_n}$ અચળાંકો છે અને ${c_n} \ne 0$,તો $n$ નું મૂલ્ય શોધો.

  • A
    $15$
  • B
    $6$
  • C
    $1$
  • D
    $0$

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ધારો કે $\alpha, \beta$ એવા છે કે જેથી $\pi < (\alpha - \beta) < 3\pi$ થાય. જો $\sin \alpha + \sin \beta = -\frac{21}{65}$ અને $\cos \alpha + \cos \beta = -\frac{27}{65}$ હોય,તો $\cos \frac{\alpha - \beta}{2}$ ની કિંમત શોધો.

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જો $\alpha + \beta + \gamma = 2\pi$ હોય,તો

જો $x = a \cos^3 \theta$ અને $y = b \sin^3 \theta$ હોય,તો:

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