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Composition of Inverse Trigonometric Functions and Trigonometric Functions

1+cosπ101+cos...

Question

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

True

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False

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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})

(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})

c o s \frac{π}{11} + c o s \frac{3 π}{11} + c o s \frac{5 π}{11} + c o s \frac{7 π}{11} + c o s \frac{9 π}{11} = \frac{1}{2}

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