'True' (सत्य) या 'False' (असत्य) लिखिए और अपने उत्तर का औचित्य बताइए।
व्यंजक $(\cos^{2} 23^{\circ} - \sin^{2} 67^{\circ})$ का मान धनात्मक है।

  • A
    True
  • B
    False
  • C
  • D

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$\sin^{2} 15^{\circ} + \sin^{2} 75^{\circ} = \dots$

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