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If cos4x=a0+a1cos^2x+a^2cos^4x is true f...

If `cos4x=a_0+a_1cos^2x+a^2cos^4x` is true for all values of `x in R ,` then the value of `5a_0+a_1+a_2` is_______

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CENGAGE ENGLISH-TRIGONOMETRIC FUNCTIONS-All Questions
  1. A circle of radius 4cm is inscribed in A B C , which touches the side...

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  2. If sin^2theta=(x^2+y^2+1)/(2x) , then x must be -3 (b) -2 (c) 1...

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  3. If cos4x=a0+a1cos^2x+a^2cos^4x is true for all values of x in R , the...

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  4. If A B C ,sinC+cosC+sin(2B+C)-cos(2B+C)=2sqrt(2.) Prove that A B C ...

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  5. In triangle A B C , let /c=pi/2dot If r is the inradius and R is circu...

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  6. Suppose ABCD (in order) is a quadrilateral inscribed in a circle. Whic...

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  7. Solve sec4theta-sec2theta=2

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  8. Prove that sum(r=1)^n(1/(costheta+"cos"(2r+1)theta))=(sinntheta)/(2si...

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  9. ABC is an isosceles triangle inscribed in a circle of radius rdot If A...

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  10. Which of the following is/are correct? (tanx)^ln(sinx)>(cotx)^ln(sinx...

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  11. Solve : 5cos2theta+2cos^2(theta/2)+1=0,-pi lt theta lt pi

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  12. If x^2+y^2=x^2y^2 then find the range of (5x+12 y+7x y)/(x y) .

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  13. If H is the orthocentre of triangle A B C ,R= circumradius andP=A H+B ...

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  14. If 3tanA+4=0, then the value of 2cotA-5cosA+sinA is equal to (23)/(10)...

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  15. Solve sin2theta+costheta=0

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  16. Two medians drawn from the acute angles of a right angled triangle int...

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  17. For all, x ,y in Rdot find the range of ((x+y)(1-x y))/((1+x^2)(1+y^2...

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  18. A circle centred at 'O' has radius 1 and contains the point A. Segment...

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  19. Solve that equation : costheta+cos3theta-2cos2theta=0

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  20. If x^2+y^2=4 then find the maximum value of (x^3+y^3)/(x+y)

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