Can someone please prove this equation is an identity. Cos^2 X - sin^2 X = 2cos^
ID: 3025840 • Letter: C
Question
Can someone please prove this equation is an identity.Cos^2 X - sin^2 X = 2cos^2 x - 1
Can someone give me some tips for proving indentity, aside knowing the basic identities,pytho indetites
For example when to factor, . And when to multitiply an identity 1-cost/1-cost to prove an identity.
And also when will I know if I have to simplify the other side to prove an identity
Thank you Can someone please prove this equation is an identity.
Cos^2 X - sin^2 X = 2cos^2 x - 1
Can someone give me some tips for proving indentity, aside knowing the basic identities,pytho indetites
For example when to factor, . And when to multitiply an identity 1-cost/1-cost to prove an identity.
And also when will I know if I have to simplify the other side to prove an identity
Thank you
Cos^2 X - sin^2 X = 2cos^2 x - 1
Can someone give me some tips for proving indentity, aside knowing the basic identities,pytho indetites
For example when to factor, . And when to multitiply an identity 1-cost/1-cost to prove an identity.
And also when will I know if I have to simplify the other side to prove an identity
Thank you
Explanation / Answer
cos2x - sin2x= 2 cos2x-1
RHS:
2 cos2x-1
[ from sin2x + cos2x=1]
=2 cos2x- ( sin2x + cos2x)
= 2 cos2x- sin2x - cos2x
= cos2x - sin2x
= LHS
hence proved