cos^2A-sin^2A=2cos^2A-1
any one can prove this??
Answers
Answered by
0
Answer:
yes!!!
start of you learn the table of the degree and you also known the formula
Step-by-step explanation:
hence you prove it
plz like this answer aur plz follow kr dena
Answered by
1
Answer:
Let us first find the value of left hand side (LHS) that is
cos 2
sin 2
as shown below:
cos 2
sin 2
=
cos 2
(1−
cos 2
(∵1−cos
2
x=sin
2
x)
=
cos 2
1+
cos 2
=2cos
2
A−
1=
RHS
Since LHS=RHS,
Hence,
cos 2
sin 2
2cos
2
A−
1
.
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