Mathematics · Trigonometry
एक समकोण समलंब (right-angled trapezium) ABCD में, AB, DC के समानांतर है और BC पर लंबवत है। यदि विकर्ण BD = 13 सेमी, DC = 5 सेमी, और AB = 14 सेमी है, तो कोण φ = ∠DBC और θ = ∠DAB के लिए, व्यंजक sin(φ) + tan(θ)sin(φ) - tan(θ) का मान ज्ञात कीजिए।
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