यदि $A(n) = \sin^n \alpha + \cos^n \alpha$ है,तो $A(1) A(4) + A(2) A(5) =$

  • A
    $A(1) A(2) + A(4) A(5)$
  • B
    $A(1) A(6) + A(2) A(3)$
  • C
    $A(1) A(3) + A(2) A(6)$
  • D
    $A(1) A(2) + A(3) A(6)$

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यदि $x \cos \theta + y \sin \theta = 5$ और $x \sin \theta - y \cos \theta = 3$ है,तो $x^{2} + y^{2}$ का मान ज्ञात कीजिए।

समीकरण $y = \sin \,x \sin \,(x + 2) - \sin^2 \,(x + 1)$ एक सीधी रेखा को दर्शाता है जो स्थित है

$\sum\limits_{r = 1}^{89} {{\log _3}(\tan {r^o})} = $

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$\cos^2 10^\circ - \cos 10^\circ \cos 50^\circ + \cos^2 50^\circ$ का मान किसके बराबर है:

यदि $\sum_{r=1}^{50} \tan ^{-1} \frac{1}{2 r^2}=p$ है,तो $\tan p$ का मान ज्ञात कीजिए।

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