Search for: The value of 1+cos56∘+cos58∘−cos66∘is equal toThe value of 1+cos56∘+cos58∘−cos66∘is equal toA2cos28∘cos29∘cos33∘B4cos28∘cos29∘sin33∘C4cos28∘cos29∘cos33∘D2cos28∘cos29∘sin33∘ 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:1+cos56∘+cos58∘−cos66∘=2cos228∘+2sin62∘sin4∘=2cos228∘+2cos28∘cos86∘=2cos28∘cos28∘+cos86∘=2cos28∘2cos57∘cos29∘=4cos28∘cos29∘cos33∘Post navigationPrevious: cos2π7+cos4π7+cos6π7Next: If cosα+cosβ=0=sinα+sinβ then cos2α+cos2β is equal toRelated content JEE Advanced 2023 NEET Rank Assurance Program | NEET Crash Course 2023 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