मराठी

The value of the expression sin6 θ + cos6 θ + 3 sin2 θ . cos2 θ is ______. -

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प्रश्न

The value of the expression sin6 θ + cos6 θ + 3 sin2 θ . cos2 θ is ______.

पर्याय

  • 0

  • 2

  • 3

  • 1

MCQ
रिकाम्या जागा भरा

उत्तर

The value of the expression sin6 θ + cos6 θ + 3 sin2 θ . cos2 θ is 1.

Explanation:

sin6 θ + cos6 θ + 3 sin2 θ cos2 θ

= (sin2 θ)3 + (cos2 θ)3 + 3 sin2 θ cos2 θ

= (sin2 θ + cos2 θ) (sin4 θ + cos4 θ – sin2 θ cos2 θ) + 3 sin2 θ cos2 θ

= 1[(sin2 θ + cos2 θ)2 – 3 sin2 θ cos2 θ] + 3 sin2 θ cos2 θ

= 1 – 3 sin2 θ cos2 θ + 3 sin2 θ cos2 θ

= 1

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