11. If dy + 2y tan x = sin x, 0 15. Let a=ai+j-k and b=2i+j-ak,...

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11. If dy + 2y tan x = sin x, 0 15. Let a=ai+j-k and b=2i+j-ak, a>0. If the projection of axb on the vector -i+2]-2k is 30, then a equal to: (a) 12 15 (b) 8 (c) 1/3 32 (d) 7 11. If dy + 2y tan x = sin x, 0 15. Let a=ai+j-k and b=2i+j-ak, a>0. If the projection of axb on the vector -i+2]-2k is 30, then a equal to: (a) 12 15 (b) 8 (c) 1/3 32 (d) 7