- A(4n+1)2π,n∈Z
- B2nπ+3π,n∈Z
- Cnπ+2π,n∈Z
- D2nπ+6π,n∈Z
Solution
(a) Given
(sinx−cos2x)≥(3−3sinx+sin2x)+4|sinx−1|
(sin2x+sinx−1)≥(sin2x−3sinx+3)
((sin2x−3sinx+3)+(4sinx−4))
≥(sin2x−3sinx+3)+|4sinx−4|
If|a+b|≥|a|+|b|ab≥0
(sin2x−3sinx+3)(4sinx−4)≥0
sin2x−3sinx+3>0∀x∈R
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