Hi pls help me thankssspls provide me with workings thankss :)
1 answer:
Step-by-step explanation:
(i)
Using cos(a - b) = cos a cos b + sin a sin b
= cos a cos b + 
cos a cos b = 
(ii)
Using cos(a + b) = cos a cos b - sin a sin b
cos(a + b) = 
(iii)
Using cot a = 


× 
= 3
please give me a brainliest answer
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