JEE Advanced 2020 Full Test 6 Paper 2
© examsiri.com
Question : 41 of 54
Marks:
+1,
-0
Let a , b ∈ [ 0 , π ] , 2 cos (
) + 6 cos a + 7 cos b + 9 cos (
) = 0 2 sin (
) − 6 sin a + 7 sin b − 9 sin (
) = 0 . cos ( a + b )
Go to Question: