Factorize the expression Cos4m – Sin4m
Solution
=
Cos4m – Sin4m
=
(Cos2m)2 – (Sin2m)2.
=
(Cos2m – Sin2m) (Cos2m – Sin2m).[Since a2 – b2
=(a-b)(a+b)]
= (Cos2m – Sin2m) (Cos2m –
Sin2m) answer
TRY
THIS………….
Factorize
the expression Cos8c – Sin8c
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