B-3.a If tano + sece then seco is B...
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B-3.a If tano + sece then seco is B-4. Show that: (i) sin 20°. cos 40° + cos 20° sin 40° = 1312 (ii) cos 100° cos 40° + sin 100°. sin 40° = 1/2

JEE/Engineering Exams
Maths
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( tan theta+sec theta=frac{2}{3} ) then oeco és ( tan theta=frac{2}{3}-sec theta ) ( tan ^{2} theta=frac{4}{9}+sec ^{2} theta-frac{4}{3} sec theta ) ( sec ^{2} theta-1=frac{4}{9}+sec ^{2} theta-frac{4}{3} sec theta ) ( -frac{4}{3} frac{4}{3}=frac{4}{9}=-frac{4}{3} sec theta ) ( frac{4}{3} sec theta=frac{4}{9} ) ( frac{4}{3} sec theta=frac{13}{9} ) ( sec theta=frac{13 times 3}{9 times 4}=frac{39}{36}=frac{13}{12} mathrm{Am} )
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