Q3Multiple choiceExercise 8.1
3 2 4 13. If sinθ – cosθ = 0, then the value of (sin4θ + cos4θ) is 3 1 1
- (A)1
- (B)
- (C)
- (D)4 2 4 14. sin (45° + θ) – cos (45° – θ) is equal to (A) 2cosθ (B) 0 (C) 2sinθ (D) 1 15. A pole 6 m high casts a shadow 2 3 m long on the ground, then the Sun’s elevation is (A\) 60° (B) 45° (C) 30° (D) 90°
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(B)