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Cos2 45° + sin2 60° + sin2 30° = ______. - Mathematics

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Question

cos2 45° + sin2 60° + sin2 30° = ______.

Options

  • 1

  • `1 1/4`

  • `1 1/2`

  • `1 1/3`

MCQ
Fill in the Blanks
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Solution

cos2 45° + sin2 60° + sin2 30° = `underlinebb(1 1/2)`.

Explanation:

`cos^2 45° = 1/2, sin^2 60° = 3/4, sin^2 30° = 1/4`

`1/2 + 3/4 + 1/4 = 3/2 = 1 1/2`.

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Chapter 19: Trigonometry - MULTIPLE CHOICE QUESTIONS. [Page 238]

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B Nirmala Shastry Mathematics [English] Class 9 ICSE
Chapter 19 Trigonometry
MULTIPLE CHOICE QUESTIONS. | Q 9. | Page 238
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