Search for: Letf(θ)=sinθ(sinθ+sin3θ).Thenf(θ)Letf(θ)=sinθ(sinθ+sin3θ).Thenf(θ)A⩾0 only when θ⩾0B⩽0 for all θC⩾0 for all θD⩽0 only when θ⩽0 Register to Get Free Mock Test and Study Material +91 Verify OTP Code (required) I agree to the terms and conditions and privacy policy. Solution:f(θ)=sin θ(sin θ + sin 3θ)=sin θ.2sin 2θ cosθ =2 sin θ cosθ sin 2θ=sin2 2θ⩾0 for all θ Post navigationPrevious: Let R be a relation defined by R={(a,b):a≥b}, where a and b are real numbers, then R isNext: The period of f(x)= sin x + cos x isRelated content JEE Main 2023 Question Papers with Solutions JEE Main 2024 Syllabus Best Books for JEE Main 2024 JEE Advanced 2024: Exam date, Syllabus, Eligibility Criteria JEE Main 2024: Exam dates, Syllabus, Eligibility Criteria JEE 2024: Exam Date, Syllabus, Eligibility Criteria NCERT Solutions For Class 6 Maths Data Handling Exercise 9.3 JEE Crash Course – JEE Crash Course 2023 NEET Crash Course – NEET Crash Course 2023 JEE Advanced Crash Course – JEE Advanced Crash Course 2023