हिंदी

In a ΔABC, if ∠A = ππ2, then cos2 B + cos2 C is equal to ______. -

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प्रश्न

In a ΔABC, if ∠A = `π/2`, then cos2 B + cos2 C is equal to ______.

विकल्प

  • –2

  • –1

  • 1

  • 0

MCQ
रिक्त स्थान भरें

उत्तर

In a ΔABC, if ∠A = `π/2`, then cos2 B + cos2 C is equal to 1.

Explanation:

cos2 B + cos2

= `cos^2B + cos^2(π/2 -B)`

= cos2 B + sin2

= 1 

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