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If f(n)=prod(r=1)^(n)cos r,n in N, then...

If `f(n)=prod_(r=1)^(n)cos r,n in N`, then

A

`|f(n)| gt |f(n+1)|`

B

`f(5) gt 0`

C

`f(4) gt 0`

D

`|f(n)|lt |f(n+1)|`

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A
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VK JAISWAL ENGLISH-COMPOUND ANGLES-Exercise-5 : Subjective Type Problems
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  11. If the expression (sin theta sin2theta+sin3theta sin60theta+sin4theta...

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  13. If sin^(3)theta+sin^(3)(theta+(2pi)/(3))+sin^(3)(theta+(4pi)/(3))=a s...

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  14. If sum(r=1)^(n)((tan 2^(r-1))/(cos2^(r )))=tanp^(n)-tan q, then find t...

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  15. If x=sec theta-tan theta and y="cosec"theta+cot theta," then " y-x-xy...

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  18. If x=alpha satisfy the equation 3^(sin2x+2cos^(2)x)+3^(1-sin2x+2sin^(...

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  19. If y=(sin theta+"cosec" theta)^(2) +(cos theta+sec theta)^(2), then m...

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  20. If tan20^(@)+tan40^(@)+tan80^(@)-tan60^(@)=lambda sin40^(@), then lamb...

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