The value of the expression 1-cos-101-cos3-101-cos7-101-cos9-10 is-

The correct option is B 116 correct answer is 1/16 ...

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Period of Trigonometric Ratios

The value of ...

Question

The value of the expression $(1 + cos \frac{π}{10}) (1 + cos \frac{3 π}{10}) (1 + cos \frac{7 π}{10}) (1 + cos \frac{9 π}{10})$ is?

\frac{1}{8}

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\frac{1}{16}

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\frac{1}{4}

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(1 + c o s \frac{π}{10}) (1 + c o s \frac{3 π}{10}) (1 + c o s \frac{7 π}{10}) (1 + c o s \frac{9 π}{10}) = \frac{1}{16}

(1 - cos \frac{π}{10}) (1 + cos \frac{3 π}{10}) (1 + cos \frac{7 π}{10}) (1 - cos \frac{9 π}{10})

(1 + cos \frac{π}{10}) (1 + cos \frac{3 π}{10}) (1 + cos \frac{7 π}{10}) (1 + cos \frac{9 π}{10}) = \frac{1}{16}

(1 + c o s \frac{π}{10}) (1 + c o s \frac{3 π}{10}) (1 + c o s \frac{7 π}{10}) (1 + c o s \frac{9 π}{10})

Find the value of (1 + Cos π/8)×.(1+cos3π/8)×(1+cos 5π/8 ) ×(1+cos7π/8) .

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