If cos (a+b)=0, then sin (a-b)= …
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Payal Singh 6 years, 10 months ago
1) cos 2b
Explanation:
cos (a+b) =0
=> cos (a+b) = cos 90
=> a+b = 90
=> a = 90- b
Now
sin(a+b)
= sin(90-b-b)
= sin(90-2b)
= cos 2b [as sin (90 - x) = cos x]
2Thank You