Question
Download Solution PDFIf f(p) = sinp + 2x + cosp + 2x, then the value of 6f(2) - 4ƒ(4) + 10f(0) is:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven:
f(p) = sinp + 2x + cosp + 2x
Calculation:
To find the value of 6f(2) - 4f(4) + 10f(0), first calculate f(p) for p = 2, p = 4, and p = 0:
For p = 2:
f(2) = sin4x + cos4x
For p = 4:
f(4) = sin6x + cos6x
For p = 0:
f(0) = sin2x + cos2x
We know that sin2x + cos2x = 1.
Using the identity for sin4x + cos4x:
sin4x + cos4x = (sin2x + cos2x)2 - 2sin2x cos2x
sin4x + cos4x = 1 - 2sin2x cos2x
Using the identity sin2x cos2x = (1/4)sin2(2x):
sin4x + cos4x = 1 - (1/2)sin2(2x)
To find sin6x + cos6x, use the identity:
sin6x + cos6x = (sin2x + cos2x)3 - 3sin2x cos2x(sin2x + cos2x)
sin6x + cos6x = 1 - 3(sin2x cos2x)
sin6x + cos6x = 1 - (3/4)sin2(2x)
Now calculate 6f(2) - 4f(4) + 10f(0):
6f(2) = 6(sin4x + cos4x) = 6(1 - (1/2)sin2(2x))
4f(4) = 4(sin6x + cos6x) = 4(1 - (3/4)sin2(2x))
10f(0) = 10(sin2x + cos2x) = 10
Combine:
6f(2) - 4f(4) + 10f(0)
= 6[1 - (1/2)sin2(2x)] - 4[1 - (3/4)sin2(2x)] + 10
= 6 - 3sin2(2x) - 4 + 3sin2(2x) + 10
= 6 - 4 + 10
= 12
The value of 6f(2) - 4f(4) + 10f(0) is 12.
Last updated on May 28, 2025
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