Trigonometry Practice: The value of (sin2 25° + sin2 65°)

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The value of (sin2 25° + sin2 65°)

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sin(90° − Θ) = cos Θ ⇒ sin 65° = sin(90° − 25°) = cos...

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Solution

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sin(90° − Θ) = cos Θ sin2 Θ + cos2 Θ = 1

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