cos 3A - 2 cos 4A /
Sin 3A + 2 sin 4A
if A=15
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15
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ayushi618:
hey dear.. but cos 60 = 1/2
no you are wrong. cos 30 is 1/2
i think that was the mistake you made
no u can go through the net.. if u feel I'm wrong.. but.. cos 60=1/2 and cos 30 =root 3 by 2
oh yas sorry. such a big silly mistake.
my fault
i apologise
no problem! dear
Answered by
2
Answer:1/5×(√6-1-2√3+√2)
Step-by-step explanation:
Put value in A .
Cos 45.. 1/√2
Cos 60..1/2
Sin 60..√3/2
Put the value in their corresponding places
Simplify it you will get the answer
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