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Assignment:Find the solution set of inequality sqrt(ln((sin(1/x)+lg(tanx+e3))/cosx)) >e .
Question type: Inequality
Solution:
The inequality can be reduced to 1 inequality:
sqrt ( ln ( ( sin ( 1 / x ) + lg ( tan x + e 3 ) ) / cos x ) ) > e (1)
From the definition field of divisor
x ≠ 0 (2 )
From the definition field of lg
tan x + e 3 > 0 (3 )
From the definition field of ln
( sin ( 1 / x ) + lg ( tan x + e 3 ) ) / cos x > 0 (4 )
From the definition field of √
ln ( ( sin ( 1 / x ) + lg ( tan x + e 3 ) ) / cos x ) ≥ 0 (5 )
From inequality(1):
x > 23.614357
From inequality(2):
x < 0 或 x > 0
From inequality(3):
x < -14.087421 或 -7.804236 < x < -4.712389 或 1.620542 < x < 4.712389 或 x > 10.995574
From inequality(4):
-7.80068 < x < -4.658248 或 -1.50822 < x < 1.621204 或 4.763714 < x < 7.905648 或 11.047413 < x < 14.189108
From inequality(5):
-1.505443 ≤ x ≤ -1.087832 或 -0.360426 ≤ x ≤ -0.151528 或 -0.151528 ≤ x ≤ 0.285804 或 x ≥ 23.614357
From inequalities (1) and (2)
x > 23.614357 (6)
From inequalities (3) and (6)
x > 23.614357 (7)
From inequalities (4) and (7)
x ∈ Φ (Φ is empty)that is, the inequality will never be estatlished within the real number range! (8)
From inequalities (5) and (8)
x ∈ Φ (Φ is empty)that is, the inequality will never be estatlished within the real number range! (9)
The final solution set is :
x ∈ Φ (Φ is empty)that is, the inequality will never be estatlished within the real number range! *Note: Radian.Your problem has not been solved here? Please take a look at the hot problems !