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11. Find the value of x in the following(i) cos x = cos60° cos30° + sin60° sinar4 |
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Answer» cos60=1/2cos30=√3/2sin60=√3/2sin30=1/2hence1/2*√3/2+1/2*√3/2=√3/4+√3/4=√3/2hencecosx=√3/2x=30° |
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