यदि $f(a + b - x) = f(x)$ है,तो $\int_{a}^{b} x f(x) dx$ किसके बराबर है?

  • A
    $\frac{a+b}{2} \int_{a}^{b} f(b-x) dx$
  • B
    $\frac{a+b}{2} \int_{a}^{b} f(b+x) dx$
  • C
    $\frac{a+b}{2} \int_{a}^{b} f(x) dx$
  • D
    $\frac{b-a}{2} \int_{a}^{b} f(x) dx$

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मान लीजिए $f(x) = 7 \tan^8 x + 7 \tan^6 x - 3 \tan^4 x - 3 \tan^2 x$ सभी $x \in \left(-\frac{\pi}{2}, \frac{\pi}{2}\right)$ के लिए है। तो सही व्यंजक है/हैं:
$(A) \int_0^{\pi/4} x f(x) dx = \frac{1}{12}$
$(B) \int_0^{\pi/4} f(x) dx = 0$
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$(D) \int_0^{\pi/4} f(x) dx = 1$

यदि $\int_{-1}^{1} f(x) \, dx = 0$ है,तो

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