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If sin""(pix)/(2)=x^(2)-2x+2, then the v...

If `sin""(pix)/(2)=x^(2)-2x+2`, then the value of x is

A

0

B

1

C

`-1`

D

None of these

Text Solution

AI Generated Solution

The correct Answer is:
To solve the equation \( \sin(\pi x) = x^2 - 2x + 2 \), we will follow these steps: ### Step 1: Understand the equation We have the equation: \[ \sin(\pi x) = x^2 - 2x + 2 \] We need to find the values of \( x \) that satisfy this equation. ### Step 2: Analyze the left-hand side (LHS) The left-hand side, \( \sin(\pi x) \), can take values between -1 and 1 for all real \( x \). Therefore, we need to ensure that the right-hand side (RHS), \( x^2 - 2x + 2 \), also falls within this range. ### Step 3: Analyze the right-hand side (RHS) The expression \( x^2 - 2x + 2 \) is a quadratic equation. We can rewrite it in vertex form: \[ x^2 - 2x + 2 = (x-1)^2 + 1 \] This shows that the minimum value of \( x^2 - 2x + 2 \) occurs at \( x = 1 \) and is equal to 1. ### Step 4: Set up the inequality Since \( \sin(\pi x) \) can only take values between -1 and 1, we set up the inequality: \[ 1 \leq x^2 - 2x + 2 \leq 1 \] This implies that: \[ x^2 - 2x + 2 = 1 \] ### Step 5: Solve the equation Now we solve the equation: \[ x^2 - 2x + 2 - 1 = 0 \] which simplifies to: \[ x^2 - 2x + 1 = 0 \] Factoring gives: \[ (x - 1)^2 = 0 \] Thus, we find: \[ x - 1 = 0 \implies x = 1 \] ### Step 6: Verify the solution Now we need to check if \( x = 1 \) satisfies the original equation: - LHS: \( \sin(\pi \cdot 1) = \sin(\pi) = 0 \) - RHS: \( 1^2 - 2 \cdot 1 + 2 = 1 - 2 + 2 = 1 \) Since LHS (0) does not equal RHS (1), we need to check other possible values. ### Step 7: Check other integer values Let's check \( x = 0 \): - LHS: \( \sin(\pi \cdot 0) = \sin(0) = 0 \) - RHS: \( 0^2 - 2 \cdot 0 + 2 = 2 \) Now check \( x = 2 \): - LHS: \( \sin(\pi \cdot 2) = \sin(2\pi) = 0 \) - RHS: \( 2^2 - 2 \cdot 2 + 2 = 2 \) ### Conclusion After checking possible values, we find that the only solution that satisfies the equation is \( x = 1 \). ### Final Answer The value of \( x \) is: \[ \boxed{1} \]
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