Practicing Success
What will be the value of $\frac{sin 30° sin 40° sin 50° sin 60°}{cos30° cos40°cos50°cos60°}$?
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$\frac{1}{\sqrt{2}}$ $\sqrt{3}$ 1 $\frac{1}{\sqrt{3}}$ |
1 |
we know , sinA = cos ( 90° - A ) \(\frac{sin 30° . sin40° . sin50° . sin60° }{cos 30° . cos40° . cos50° . cos60° }\) = \(\frac{ cos ( 90° - 30° ) . cos ( 90° - 40° ) . cos ( 90° - 50° ) . cos ( 90° - 60° ) }{cos 30° . cos40° . cos50° . cos60° }\) = \(\frac{cos60° . cos50° . cos40° . cos30° }{cos 30° . cos40° . cos50° . cos60° }\) = 1 |