If f(p) = sinp + 2x + cosp + 2x, then the value of 6f(2) - 4ƒ(4) + 10f(0) is:

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SSC CHSL Exam 2024 Tier-I Official Paper (Held On: 10 Jul, 2024 Shift 2)
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  1. 14
  2. 12
  3. 11
  4. 10

Answer (Detailed Solution Below)

Option 2 : 12
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Detailed Solution

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Given:

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.

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