7cos²φ+3 sin²φ=3 then φ=? A) 0°,B) 30°,(C) 60°and (D) 90°
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Answer:
option (d) is correct...i.e. φ= 90°
Step-by-step explanation:
7 cos² 90° + 3 sin² 90°
7 × 0² + 3 × 1²
0 +3
3
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