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Question
θ = 30° लेकर निम्नलिखित त्रिकोणमितीय सर्वसमिका की जाँच कीजिए:
sin2θ + cos2θ = 1
Theorem
Solution
दत्त: θ = 30°
साध्य: sin2θ + cos2θ = 1
उपपत्ति:
बायां पक्ष = sin2θ + cos2θ
= sin230° + cos230°
= `(1/2)^2 + (sqrt 3/2)^2`
= `1/4 + 3/4`
= `4/4`
= 1
बायां पक्ष = दायां पक्ष
sin2θ + cos2θ = 1
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