Question

Q I. Choose the correct option (Marks 05) 1. The value of Cos2 (╥ + θ) – Sin2 (╥ - θ) (A)cos2θ
(B)- cos2 θ (C) (D) 0 2. The value of Sin 50° - Sin 70° + Sin 10° is (A) 0 (B)1 (C) - 1 (D) None of these 3. The smallest positive angle which satisfies 2 Sin2θ + √3 cosθ + 1= 0 is (A) ╥ (B)5╥ (C) 2╥ (D) None of these 4. If cosθ = - and 0 <θ< 360°, the n θ= (A) 60°, 240° (B)120°, 210° (C) 120°, 240° (D) None of these 5. The value of ° ° ° ° is (A) Cot 56° (B)Tan 56° (C) Cot 34° (D) None of these​

Answer 1

Answer:The given expression sin10∘+sin50∘−sin70∘ can also be written as sin10∘−(sin70∘−sin50∘)

=sin10∘−(2cos60∘sin10∘)

=sin10∘(2cos60∘−1)=sin10∘(1−1)=0

Step-by-step explanation: