Practicing Success
What is the value of $\frac{sin33°cos57°+sec62°sin28°+cos33°sin57°+cosec62°cos28°}{tan15°tan35°tan60°tan55°tan75°}$ ? |
$\frac{\sqrt{3}}{3}$ 2 $2\sqrt{3}$ $\sqrt{3}$ |
$\sqrt{3}$ |
Using , sinA = cosB ( A + B = 90° ) & tanA × tanB = 1 ( A + B = 90° ) $\frac{sin33°cos57°+sec62°sin28°+cos33°sin57°+cosec62°cos28°}{tan15°tan35°tan60°tan55°tan75°}$ = $\frac{sin33°sin33°+sec62°cos62°+cos33°cos33°+cosec62°sin62°}{tan15° ×tan75°tan35°×tan55°×√3 }$ = $\frac{1+1+1}{√3 }$ = $\frac{3}{√3 }$ = √3 |