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Double Angle Formula and Reduction Formula is considered one of the most asked concept.
40 Questions around this concept.
If
If
If
The value of
Double Angle Formula and Reduction Formula
Proof:
The double-angle formulas are a special case of the sum formulas, where α = β.
For sine
If we let
For cosine
Letting
We can write this formula in different forms as per the requirement of the question,
The second variation is:
For tan
Replacing
Reduction Formula
The double-angle formulas can be used to derive the reduction formulas, which are formulas we can use to reduce the power of a given expression involving even powers of sine or cosine.
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Mathematics for Joint Entrance Examination JEE (Advanced) : Trigonometry
Page No. : 3.11
Line : 26
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