Integrate cos(2theta)d(theta) from 0 to pi/5

1 answer:

3 0

$\int\limits^ \frac{ \pi }{4} _0 {cos2t} \, dt = \frac{sin2t}{2} I\limits^ \frac{ \pi }{4} _0 = \\ = \frac{sin( \pi/2) }{2}- \frac{sin (0)}{2}= \frac{1}{2}$
Answer: 1/2

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Step-by-step explanation:

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Hence, the diagonal opposite to the angle 39 degree will be the shorter one. A diagonal divides the parallelogram in two triangles. So we will have two sides and an included angle and we have to find the third side of the triangle which can be found using the law of cosines. Let the third side be c as shown in image below, using the law of cosines, we can write:

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