As per the given question,
Evaluate: $\int\frac {dx}{(sin^{4}x+cos^{4}x)}$
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Exercise 14A
Evaluate: $\int \frac{(x^{2}+1)}{\left(x^{4}+x^{2}+1\right)} dx$
As per the given question,
Evaluate: $\int \frac{\left(1-x^{2}\right)}{\left(1+x^{4}\right)} d x$
As per the given question,
Evaluate: $\int\frac {dx} {(sin x\;-\;2\;cos x)(2\;sinx\;+\;cos x)}$
As per the given question,
Evaluate: $\int \frac{(2 \sin 2 \phi-\cos \phi)}{\left(6-\cos ^{2} \phi-4 \sin \phi\right)} d \phi$
As per the given question,
Evaluate: $\int \frac{\sin 2 x}{\left(\sin ^{4} x+\cos ^{4} x\right.} d x$
As per the given question,
Evaluate: $\int \frac{d x}{\left(\sin x \cos x+2 \cos ^{2} x\right)}$
As per the given question,
Evaluate: $\int \frac{d x}{\left(\sin ^{2} x-4 \cos ^{2} x\right)}$
As per the given question,
Evaluate: $\int \frac{d x}{\left(\cos ^{2} x-3 \sin ^{2} x\right)}$
As per the given question,
Evaluate: $\int \frac{d x}{\left(a^{2} \cos ^{2} x+b^{2} \sin ^{2} x\right)}$
As per the given question,
Evaluate: $\int \frac{d x}{\left (2+sin^{2}x \right)}$
As per the given question,
Evaluate: $\int \frac{d x}{\left (1+cos^{2}x \right)}$
As per the given question,
Evaluate: $\int\frac {2x}{(2+x+x^{2})} dx$
As per the given question,
Evaluate: $\int \frac{(\left.x-x^{2}\right)}{\left(2 x^{2}+2 x+1\right)} d x$
As per the given question,
Evaluate: $\int \frac{(1-3 x)}{\left(2 x^{2}+4 x+2\right)} d x$
As per the given question,
Evaluate: $\int \frac{x^{2}}{\left(x^{2}+6 x-3\right)} d x$
As per the given question,
Evaluate: $\int \frac{(2 x-3)}{\left(x^{2}+3 x-18\right)} d x$
As per the given question,
Evaluate: $\int \frac{(x-3)}{\left(x^{2}+2 x-4\right)} d x$
As per the given question,
Evaluate: $\int \frac{x}{\left(x^{2}+3 x+2\right)} d x$
As per the given question,
Evaluate: $\int \frac{d x}{\left(3-2 x-x^{2}\right)}$
As per the given question,
Evaluate: $\int \frac{d x}{\left(2 x^{2}-x-1\right)}$
As per the given question,
Evaluate: $\int \frac{d x}{\left(2 x^{2}+x+3\right)}$
As per the given question,
Evaluate: $\int \frac{d x}{\left(4 x^{2}-4 x+3\right)}$
As per the given question,
Evaluate: $\int \frac{d x}{\left(x^{2}+4 x+8\right)}$
As per the given question,
Evaluate: $\int \frac{x^{2}}{\left(a^{6}-x^{6}\right)} d x$
As per the given question,
Evaluate: $\int \frac{x}{\left(1-x^{4}\right)} d x$
As per the given question,
Evaluate: $\int \frac{d x}{\left(e^{x}+e^{-x}\right)}$
As per the given question,
Evaluate: $\int \frac{2 x^{3}}{\left(4+x^{8}\right)} d x$
As per the given question,
Evaluate:$\int \frac{3 x^{5}}{\left(1+x^{12}\right)} d x$
As per the given question,
Evaluate: $\int \frac{\cos x}{\left(1+\sin ^{2} x\right)} d x$
As per the given question,
Evaluate: $\int \frac{\sin x}{\left(1+\cos ^{2} x\right)} d x$
As per the given question,
Evaluate: $\int \frac{e^{x}}{\left(e^{2 x}+1\right)} d x$
As per the given question,
Evaluate: $\int \frac{x^{2}}{\left(9+4 x^{2}\right)} d x$
As per the given question,
Evaluate: $\int \frac{\left(x^{2}-1\right)}{\left(x^{2}+4\right)} d x$
As per the given question,
Evaluate: $\int \frac{d x}{\left(16 x^{2}-25\right)}$
As per the given question,
Evaluate: $\int \frac{d x}{\left(50+2 x^{2}\right)}$
As per the given question,
Evaluate: $\int \frac{d x}{\left(4+9 x^{2}\right)}$
As per the given question,
Evaluate: $\int \frac{d x}{\left(x^{2}+16\right)}$
As per the given question,
Evaluate: $\int \frac{d x}{\left(25-4 x^{2}\right)}$
As per the given question,
Evaluate: $\int \frac{d x}{(1-9 x)^{2}}$
As per the given question,