prove that:(2 cos a + 1) (2 cos a - 1) (2 cos 2a - 1) = 2 cos 4a + 1
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Answer:
true
Step-by-step explanation:
first take (2cos a + 1)(2cos a - 1)
use formula (a+b)(a-b) we get a^2 - b^2
then use formula cos2x = 2(cos x)^2 -1
further simplify it and use the same method for 3rd expression 2(cos 2a) -1
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