AP EAMCET · Maths · Trigonometric Ratios & Identities
\(\cos ^2 5^{\circ}-\cos ^2 15^{\circ}-\sin ^2 15^{\circ}+\sin ^2 35^{\circ}\) \(+\cos 15^{\circ} \sin 15^{\circ}-\cos 5^{\circ} \sin 35^{\circ}=\)
- A 0
- B 1
- C \(\frac{3}{2}\)
- D 2
Answer & Solution
Correct Answer
(A) 0
Step-by-step Solution
Detailed explanation
\begin{aligned} & \cos ^2 5^{\circ}-\cos ^2 15^{\circ}-\sin ^2 15^{\circ}+\sin ^2 35^{\circ} \\ & +\cos 15^{\circ} \sin 15^{\circ}-\cos 5^{\circ} \sin 35^{\circ} \\ & =\cos 5^{\circ}\left(\cos 5^{\circ}-\sin 35^{\circ}\right)-\cos 15^{\circ}\left(\cos 15^{\circ}-\sin…
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