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The cost of net curtain material is proportional to the length of the material. 4m costs £15.40 a) Find the cost of 5.2 m of material. b) Find the length of £9.24 worth of material. |
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Answer» Cos 0° = 1COS x = 0, when x = ±π/2, ±3π/2, ±5π/2, … It means that cos x vanishes when x is an odd multiple of π/2. So, cos x = 0 implies x = (2N + 1)π/2 , where N takes the value of any integer. |
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