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cos((65pi)/4)=............

`cos((65pi)/4)=.........`

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The correct Answer is:
`1/sqrt2`
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cos((pi)/(7))cos((2pi)/(7))cos((4pi)/(7))= ………..

The number of solution for , {:(sin(x-(pi)/4)-cos(x+(3pi)/4)=1),(" "(2cos 7x)/(cos 3+sin3) gt 2^(cos 2x)):}}" in" (0,2pi) is

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Prove that cos((3pi)/(4)+x)-cos((3pi)/(4)-x)=-sqrt(2)sinx

Prove that, cos((pi)/(4)+x)+cos((pi)/(4)-x)=sqrt(2)cosx .

KUMAR PRAKASHAN-OBJECTIVE SECTION AS PER NEW PAPER SCHEME -Trigonometric Functions (Fill in the blanks)
  1. 2sin^(2)((pi),(4))+2cos^2((pi),(4))+sec^2((pi),(3)) has value ...........

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  2. cos(pi/3)cos(pi/4) + sin(pi/3) sin(pi/4) .................

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  3. cos((65pi)/4)=.........

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  4. If cot x = - sqrt(5) and x in second quadrant then sin x = ..........

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  5. 2sin((5pi)/12) sin(pi/12)=.........

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  6. The value of (1-tan^(2)(15^(@)))/(1+tan^(2)(15^(@))) is ………..

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  7. If A +B + C = pi then secA (cos B cos C - sin B sin C) = .........

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  8. 3sin(pi/9) - 4sin^(3)(pi/9) = .......

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  9. One root of the equation 6x - 8x^3=sqrt3 is .........

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  10. (sin(3alpha))/(1+2cos(2alpha))= ..........

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  11. cos(47^@) cos (13^@) - sin (47^@) sin(13^@)= .........

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  12. sin((7pi)/(12))cos(pi/4)-cos((7pi)/(12))sin(pi/4)=...........

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  13. Sum of the measure of an angle of cyclic quadrilateral ABCD is ..........

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  14. Solution set of the equation 3 tan^(2) theta + 4 tan theta + 2 =0 is ....

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  15. For DeltaABC , sinA + sinB + sinC

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  16. In DeltaABC, m angleA = 90 , m angle B = 30 and a = 10^@ then b = .......

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  17. In DeltaABC if m angle C = 90^@ than tanA + tanB = .......

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  18. Solution of the equation 2cos x + 1 = 0 is ...........

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  19. Height of the tower and multy storied building is same of 30 mets . Th...

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  20. .......is the angle of elevation of sun if height of building and its ...

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