23 Replies
@Apu
Note for OP
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11th you can try using the functional eqn formula and relations for polynomials
I tried using functional eqn but i couldn’t get any results
,rotate
,rotate
$$ f(x+y) = f(x) \cdot f(y) + 3f(x-y)$$
$$ 3f(x) \cdot f(-y) + 3\cdot 3f(x+y)=3f(x-y) $$
$$ 8 f(x+y) + 3f(x) \cdot f(-y) = -f(x) \cdot f(y)$$
Keshav
assuming f(x) is odd
$$ 8 f(x+y) = 2f(x) \cdot f(y) $$
assuming f(x) is even
$$ 8 f(x+y) = -4f(x) \cdot f(y) $$
Keshav
well since its getting too heavy
we can just use value putting
how do i do that? Can u show me
hmm
Comrade Rock Astley
so a_i =0
Try the same for 12
Comrade Rock Astley
the main ideas are to substitute x=y=0, x=0, y=0 and x=y
Oh okay
@Real potato
+solved @Comrade Rock Astley
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