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a
0
b
2
c
-1
d
1
answer is A.
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Detailed Solution
If A+B=90°, then tanA-tanB=2tan(A-B)∴tan70°-tan20°2tan50°=2tan50°2tan50°=1 and tan50°-tan40°2tan10°=2tan10°2tan10°=1 ∴tan70°-tan20°2tan50°-tan50°-tan40°2tan10°2020=1-12020=0