Given, 7 21 + 7 22 + 7 23 + 7 24
7 21 (1 + 7 + 49 + 343) 7 21 (400)
Now, 400 is divisible by 25. The remainder will be 0
tan x = 1
then x = 45
2sin x. cos x = 2× 1/?2 x 1/?2 = 1
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