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Find all values of A between 0^@ and 720...

Find all values of A between `0^@` and `720^@`,
which satisfy the equation `2 cos^2 A -5 cosA +2 =0`.

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MODERN PUBLICATION-TRIGNOMETRY-EXERCISE
  1. Find the general solution of the equations : sin (x-y) =1/2, cos (x+...

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  2. Find all the numbers between 0 and 2 pi, which satisfy the equation 2 ...

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  3. Find all values of A between 0^@ and 720^@, which satisfy the equatio...

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  4. In any triangle ABC, prove that : sin frac (A-B)(2)= (a-b)/c cos frac ...

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  5. In any triangle ABC, prove that : a sin (A/2+B)= (b +c) sin frac (A)(2...

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  6. In any triangle ABC, prove that : a cos frac (B-C)(2)= (b +c) sin frac...

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  7. In any triangle ABC, prove that : (a-b)/c= (sin frac (A-B)(2))/(cos fr...

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  8. In any triangle ABC, prove that : (b-c)/a= (sin frac (B-C)(2))/(cos fr...

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  9. In any triangle ABC, prove that : cos frac (B-C)(2)= 2 sin frac (A)(2)...

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  10. If the sides be a,b,c then show that a cos A + B + cos B+ cos C = 4R s...

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  11. In any triangle ABC, prove that : a sin (B -C) + b sin (C -A) +c sin (...

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  12. In any triangle A B C , prove that: (a^2sin(B-C))/(sinB+sin C)+(b^2sin...

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  13. In any triangle A B C , prove that: (a^2sin(B-C))/(sinB+sin C)+(b^2sin...

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  14. In any triangle ABC, prove that : (a^2-b^2)/(cos A+cos B)+(b^2-c^2)/(c...

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  15. In any triangle ABC, prove that : a^3 sin (B-C)+ b^3 sin (C-A)+ c^3 s...

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  16. In any triangle ABC, prove that : a (cos B + cos C) = 2 (b +c) sin^2 ...

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  17. In any triangle ABC, prove that : a (cos C - cos B) = 2 (b-c) cos^2 fr...

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  18. In any triangle ABC, prove that : (a sin(B-C))/(b^2-c^2)= (b sin (C-A)...

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  19. In any triangle ABC, prove that : (c^2-a^2+b^2) tan A= (a^2-b^2+ c^2) ...

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  20. In any DeltaABC, 2 [bc cos A + ca cos B+ ab cos C]=

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