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प्रश्न
Evaluate the following: sin35° sin45° sec55° sec45°
उत्तर
sin35° sin45° sec55° sec45°
= `sin(90° - 55°) xx (1)/sqrt(2) xx (1)/(cos55°) xx sqrt(2)`
= `cos55° xx (1)/(cos55°) xx (1)/sqrt(2) xx sqrt(2)`
= 1.
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