AP EAMCET · Maths · Trigonometric Ratios & Identities
\(\tan 6^{\circ} \tan 42^{\circ} \tan 66^{\circ} \tan 78^{\circ}=\)
- A \(\frac{3}{4}\)
- B \(1\)
- C \(0\)
- D \(\frac{1}{3}\)
Answer & Solution
Correct Answer
(B) \(1\)
Step-by-step Solution
Detailed explanation
Since, we know, \(\tan (\mathrm{A}-\mathrm{B}) \tan (\mathrm{A}+\mathrm{B})=\frac{\tan ^2 \mathrm{~A}-\tan ^2 \mathrm{~B}}{1-\tan ^2 \mathrm{~A} \cdot \tan ^2 \mathrm{~B}}\)…
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