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Need tips for this q (1 Viewer)

Thread starter SummarisingHSC
Start date Jul 30, 2022

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SummarisingHSC

New Member

#1

I can't seem to think clearly for this q and the only option ic is expanding which is aids to say the least. Wuts a short quick method to use

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ExtremelyBoredUser

Bored Uni Student

#2

SummarisingHSC said:
I can't seem to think clearly for this q and the only option ic is expanding which is aids to say the least. Wuts a short quick method to useView attachment 35997

This is just trig formula.

$\cos(A)\cos(B) + \sin(A)\sin(B)= \cos(A-B)$
Hence it is
$\cos(45 + x - 45 + x) = \cos(2x)$

S

SummarisingHSC

New Member

#3

ExtremelyBoredUser said:
This is just trig formula.

$\cos(A)\cos(B) + \sin(A)\sin(B)= \cos(A-B)$
Hence it is
$\cos(45 + x - 45 + x) = \cos(2x)$

Bruh how did I not see that, thanks anyways appreciate it

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