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CBSE Class 10 Answered

cos (3A-40°)=sin80°. Then value of A
Asked by sumandevi54757 | 24 Mar, 2019, 04:00: PM
answered-by-expert Expert Answer
cos (3A -40) = sin 80
 
cos(3A-40) = cos(90-80) = cos 10
 
hence (3A-40) = 10  or  A = ( 50 / 3 )
Answered by Thiyagarajan K | 24 Mar, 2019, 06:26: PM
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