Question

$2n\pi + \frac{5\pi}{4}$, n is integer), if $(2n + 1)\pi + \frac{\pi}{4}$

• A. $\sin(A + B) = 1$ and $\cos(A - B) = \frac{\sqrt{3}}{2}$
• B. $\Rightarrow$and $A + B = \frac{\pi}{2}$
• C. $A - B = \frac{\pi}{6}$only
• D. $\Rightarrow$only

Answer 1

Answer: (B)

$\Rightarrow$and $A + B = \frac{\pi}{2}$

Answer 2

$f(x)$

$2n2(n - 1)$ or $\Rightarrow 2n(n - 1)$

$\Rightarrow$ $\tan\frac{C}{2} = \sqrt{\frac{(s - a)(s - b)}{s(s - c)}} = 1$ or $= \tan\left( \frac{\pi}{4} \right)$

$\Rightarrow$ $\sin\frac{A}{2} = \sqrt{\frac{(s - b)(s - c)}{bc}}$ and $\Rightarrow bc\sin^{2}\frac{A}{2} = (s - b)(s - c)$.