\(\frac{117}{125}\)
\(\frac{24}{25}\)
\(\frac{3}{5}\)
\(\frac{7}{25}\)
Correct answer is C
Cos (x + y)
= cos x cos y - sin x sin y
cos (x + y) = \(\frac{4}{5} \times \frac{24}{25} - \frac{3}{5} \times \frac{7}{25}\)
= \(\frac{96}{125} - \frac{21}{125} = \frac{96 - 21}{125}\)
= \(\frac{75}{125}\)
= \(\frac{3}{5}\)
A straight line 2x+3y=6, passes through the point (-1,2). Find the equation of the line. ...
\(f(x) = p + qx\), where p and q are constants. If f(1) = 7 and f(5) = 19, find f(3)....
If \(8^{x} ÷ (\frac{1}{4})^{y} = 1\) and \(\log_{2}(x - 2y) = 1\), find the value of (x ...
Solve: 8\(^{x - 2}\) = 4\(^{3x}\)...
If \(f(x) = mx^{2} - 6x - 3\) and \(f'(1) = 12\), find the value of the constant m....
If \(\begin{pmatrix} 2 & 1 \\ 4 & 3 \end{pmatrix}\)\(\begin{pmatrix}...
Find the constant term in the binomial expansion of \((2x - \frac{3}{x})^{8}\)....