Practicing Success
The value of $\frac{sin23°cos67°tan45°+cos23°sin67°cos45°}{2sin45°cos45°}$ is : |
0 2 1 $\frac{1}{\sqrt{2}}$ |
1 |
$\frac{sin23°cos67°tan45°+cos23°sin67°cot45°}{2sin45°cos45°}$ We know , sinA . cosB + cosA . sinB = sin (A + B) & tan 45° = 1 , cot 45° = 1 = \(\frac{ sin23°cos67°tan45°+cos23°sin67°cos45° }{2sin45°cos45° }\) = \(\frac{ sin23°cos67°+cos23°sin67° }{2sin45°cos45° }\) = \(\frac{ sin ( 23°+67°) }{2 × 1/√2 × 1/√2 }\) = 1 |