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sum(k=0)^(11) sec((pi)/(4)+(k pi)/(3)) s...

`sum_(k=0)^(11) sec((pi)/(4)+(k pi)/(3)) sec((pi)/(4)+((k+1)pi)/(3))` is equal to ______

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MCGROW HILL PUBLICATION-TRIGONOMETRICAL IDENTITIES AND EQUATIONS -SOLVED EXAMPLES (Numerical Answer Type Questions)
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  5. sum(k=0)^(11) sec((pi)/(4)+(k pi)/(3)) sec((pi)/(4)+((k+1)pi)/(3)) is ...

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  6. Let alpha= 3pi sum(n=1)^(oo)(1)/(n(n+1)(n+2)(n+3)). Then sqrt(3)[cos a...

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  11. If alpha=pi//11, then cos alpha+cos(3alpha)+cos(5alpha)+cos(7alpha)+...

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  12. "cosec"((pi)/(14))-4cos((2pi)/(7))=

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  14. Let alpha=pi//16, and let S=sin^(4)alpha+sin^(4)(3alpha)+sin^(4)(5a...

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  17. If 0 lt x lt 2pi, then the number of solutions of (1+sin x)(sinx)^(cos...

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  18. If 0 lt x lt 12, then the number of solutions of tan((pi)/(6)cos(2pi x...

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  19. Let [x] = greatest integer le x. If -(pi)/(2) lt x lt (pi)/(2), x n...

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