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55. मान ज्ञात करें :12 20% + डा 2 70* , SIn(90° - O)sing _cos? 20° + cos? 70° tano2 cos(90° - 0) cos 0cot 0m1 - P83 2 | . -2 .

Answer»

sin20 = sin(90-70) = cos70 cos20 = cos(90-70) = sin70

(sin20*sin20+sin70*sin70)/(cos20*cos20+cos70*cos70) + (sin(90-t)sint)/tant + (cos(90-t)cost)/cott

= (sin20*sin20+cos20*cos20)/(cos20*cos20+sin20*sin20) + (costsint)/(sint/cost) + (sintcost)/(cost/sint)

= 1/1 + cost*cost + sint*sint = 1 + 1 = 2



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