If two numbers are opposite to each other, their absolute value? Sign? Is the opposite number equal to itself? Is the absolute value equal to itself? What is the absolute value equal to its opposite number?

If two numbers are opposite to each other, their absolute value (equal), sign (opposite), opposite number equal to itself is (0), absolute value equal to itself is (non negative)

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1. If the function y = cos (ω x + π / 2) is monotonically increasing on (0, π / 4), then the value range of ω? If the function y = cos (ω x + π / 2) increases monotonically on (0, π / 4), then the value range of ω? A (-∞,2) B [2,0) C (0,2] D[2,+∞)
2. It is known that f (x) and G (x) are odd and even functions on (- A, a) respectively. It is proved that f (x) · g (x) is odd function on (- A, a)
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10. The difference between trousers and pants in English Tell the difference between trousers and pants in English,
11. Given that a, B and X are positive numbers, LG (AX) LG (BX) + 1 = 0, the range of a / B is obtained? LG (BX) LG (AX) + 1 = 0, and a, B, X are positive numbers Then (LGA + lgx) (LGB + lgx) + 1 = 0 (lgx)^2+（lga+lgb）lgx+1+lgalgb=0 This equation has a solution So (LGA + LGB) ^ 2-4lgalgb-4 ≥ 0 (lga)^2+2lgalhb+(lgb)^2-4lgalgb-4≥0 (lga-lgb)^2≥4 LGA LGB ≥ 2 or LGA LGB ≤ - 2 LG (a-b) ≥ 2 or LGA / b ≤ - 2 So a / b ≥ 100 or 0
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