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ivolga24 [154]
3 years ago
11

If sinx=4/5 what is cos(90-x)

Mathematics
1 answer:
masya89 [10]3 years ago
5 0
        sin(x) = ⁴/₅
sin⁻¹[sin(x)] = sin⁻¹(⁴/₅)
               x ≈ 53.13

       cos(90 - x) = cos(90)cos(x) + sin(90)sin(x)
cos(90 - 53.13) = cos(90)cos(53.13) + sin(90)sin(53.13)
       cos(36.87) = 0cos(53.13) + sin(53.13)
       cos(36.87) = sin(53.13)
       cos(36.87) = cos(90 - 53.13)
       cos(36.87) = cos(36.87)
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Answer:

The amount of weight he has lost in 3 months is 1.215 stone or 1 stone 3 pounds

Step-by-step explanation:

From the above question, we are to calculate the amount of weight he has lost in three months

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Let's convert all the weight lost to stone

At the start of the diet keirin weighted 14 stone 13 pounds

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14 stone 13 pounds = 14 + 0.929 = 14.929 stone

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The amount of weight he has lost is calculated as:

14.929 stone - 13.714 stone = 1.215 stone or 1 stone 3 pounds

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