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Sin65+sin43-sin29-sin7 is equal to 1 cos36 2cos18 3cos9 4none of these

Sin65+sin43-sin29-sin7 is equal to
 
1 cos36
2cos18
3cos9
4none of these

Grade:11

1 Answers

Mohammad Hesham
14 Points
4 years ago
4(none of these) correct answer is (cos11)   sin65+sin43-sin29-sin7=cos11.the answer is not in option 1,2,3 so the answer is 4

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