If 3 sino + 5 cos = 5, then what is
the value of 5 sino - 3 coso ? *
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Answer:(5sinθ - 3cosθ)= ±3
EXPLANATION:
Given:
(3 sinθ+5cosθ)²= 5²
Squaring on both sides.
(3sinθ)²+(5cosθ)²+2× 3sinθ 5cosθ= 25
[a+b= a²+b²+2ab]
9sin²θ+ 25cos²θ+30sinθcosθ= 25
9 (1-cos²θ) + 25(1-sin²θ)+30sinθcosθ=25
[sin²θ + cos²θ =1]
9-9cos²θ + 25-25sin²θ +30sinθcosθ=25
9+25 -(9cos²θ +25sin²θ -30sinθcosθ) =25
34 - (9cos²θ +25sin²θ -30sinθcosθ) =25
- (25sin²θ +9cos²θ-30sinθcosθ) =25-34
(25sin²θ+9cos²θ -30sinθcosθ) =9
(5sinθ - 3cosθ)²= 9
(5sinθ - 3cosθ)= √9
(5sinθ - 3cosθ)= ±3
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