Evaluate \(\int^{\frac{\pi}{2}} _{\frac{-\pi}{2}} cos x d...
Evaluate \(\int^{\frac{\pi}{2}} _{\frac{-\pi}{2}} cos x dx\)
zero
1
2
3
Correct answer is C
\(\int^{\frac{\pi}{2}} _{\frac{-\pi}{2}} cos x dx = [sinx]^{\frac{\pi}{2}} _{\frac{-\pi}{2}}\\
=sin\frac{\pi}{2} - sin\frac{-\pi}{2}\)
= sin90 – sin-90
= sin90 – sin270
= 1 – (-1)
= 1+1
= 2
The 6th term of a G.P is \(\frac{-2}{27}\) and its first term is 18. What is the common ratio?...
Find the solution of the equation x - 8\(\sqrt{x}\) + 15 = 0...
If x varies directly as y3 and x = 2 when y = 1, find x when y = 5...
Find the sum of the first five terms of the G.P 2,6, 18 .... ...
In the diagram O is the centre of the circle. Which of the following is/are not true? I. a = b I...
express 62 \(\div\) 3 as a decimal correct to 3 significant figures...
Find the square root of 170 - 20\(\sqrt{30}\)...
If x + 0.4y = 3 and y = \(\frac{1}{2}\)x, find the value of (x + y)...