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CBSE Class 11-science Answered

2 sin 67 1/2° cos22 1/2°= ?
Asked by sahookishorechandra967 | 17 Oct, 2020, 07:46: AM
answered-by-expert Expert Answer
As we know that sin(90 - x) = cosx, we have
 
2 sin 67 1/2o cos 22 1/2o = 2 sin(90 - 22 1/2o) cos 22 1/2o = 2 cos 22 1/2o cos 22 1/2o 
= 2 cos2(22 1/2o)
Answered by Renu Varma | 29 Dec, 2020, 01:51: PM

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