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If cos(x-y),cosx and "cos"(x+y) are in H...

If `cos(x-y),cosx and "cos"(x+y)` are in H.P., then `cosxsec(y/2) is`

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CENGAGE ENGLISH-TRIGONOMETRIC FUNCTIONS-All Questions
  1. Find the smallest positive values of xa n dy satisfying x-y=pi/4a n dc...

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  2. Let C be incircle of A B Cdot If the tangents of lengths t1,t2 and t3...

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  3. If cos(x-y),cosx and "cos"(x+y) are in H.P., then cosxsec(y/2) is

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  4. For what value of k the equation sinx+cos(k+x)+cos(k-x)=2 has real sol...

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  5. tan^6(pi/9)-33tan^4(pi/9)+27tan^2(pi/9) is equal to (a)0 (b) sqrt3 (...

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  6. If x, y in [0,2pi] then find the total number of order pair (x,y) sati...

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  7. For a positive integer n , let fn(theta)=(tantheta//2)(1+sectheta)(1+s...

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  8. If area of a triangle is 2 sq. units, then find the value of the pr...

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  9. Find the values of x in (-pi,pi) which satisfy the equation 8^(1+|cosx...

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  10. Given that a , b , c , are the side of a A B C which is right angle...

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  11. In equilateral triangle ABC with interior point D, if the perpendicula...

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  12. If (sinalpha)x^2-2x+bgeq2, for all real values of xlt=1a n dalpha in (...

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  13. Let f(theta)=sintheta(sintheta+sin3theta)dot Then f(theta) is (a)g...

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  14. In A B C ,(cot A/2+cotB/2)(asin^2B/2+bsin^2A/2)= cotC (b) ccotC (c...

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  15. The value of x in (0,pi/2) satisfying (sqrt(3)-1)/(sinx)+(sqrt(3)+1)...

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  16. Without using tables, prove that (sin12^0)(sin48^0)(sin54^0)=1/8

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  17. If cos3theta=cos3alpha, then the value of sintheta can be given by +-s...

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  18. If the sides a , b and c of A B C are in AdotPdot, prove that 2sinA/2...

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  19. alphaa n dbeta are the positive acute angles and satisfying equation ...

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  20. If a=9,b=4a n dc=8 then find the distance between the middle point of ...

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