AP EAMCET · Maths · Trigonometric Equations
A true statement among the following identities is
- A \(\cos 5 \theta=16 \cos ^5 \theta-20 \cos ^3 \theta-5 \cos \theta\)
- B \(\cos 5 \theta=20 \cos ^3 \theta-16 \cos ^5 \theta+5 \cos \theta\)
- C \(\cos 5 \theta=16 \cos ^5 \theta+20 \cos ^3 \theta-5 \cos \theta\)
- D \(\cos 5 \theta=16 \cos ^5 \theta-20 \cos ^3 \theta+5 \cos \theta\)
Answer & Solution
Correct Answer
(D) \(\cos 5 \theta=16 \cos ^5 \theta-20 \cos ^3 \theta+5 \cos \theta\)
Step-by-step Solution
Detailed explanation
\(\cos 5 \theta=\cos (4 \theta+\theta)\)…
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