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In any A B C , prove that: (cos A)/a+(c...

In any ` A B C ,` prove that: `(cos A)/a+(cos B)/b+(cos C)/c=(a^2+b^2+c^2)/(2a b c)`

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In any ABC, prove that: (cos A)/(a)+(cos B)/(b)+(cos C)/(c)=(a^(2)+b^(2)+c^(2))/(2abc)

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NAVNEET PUBLICATION - MAHARASHTRA BOARD-QUESTION BANK 2021-TRIGONOMETRIC FUNCTIONS
  1. Find the general solutions of sin x - 1 = 0

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  2. Find the Cartesian co-ordinates of point whose polar co-ordinates are ...

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  3. In any A B C , prove that: (cos A)/a+(cos B)/b+(cos C)/c=(a^2+b^2+c^2...

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  4. Find the general solutions of cos 2x = 1.

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  5. In Delta ABC, prove that (b - c)^(2) cos^(2) ((A)/(2)) + (b + c)^(2) s...

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  6. The principal solution of sinx=(-1)/(2) is

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  7. Find the value of cos^(-1) ((1)/(2)) + tan^(-1) ((1)/(sqrt(3)))

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  8. In triangleABC, if a=13, b=14, c=15, then cosB=

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  9. In Delta ABC, if (cos A)/(a) = (cos B)/(b), then show that it is an is...

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  10. The principal solution tanx=-sqrt(3) is

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  11. Evaluate cos [(pi)/(6) + cos^(-1) (-(sqrt(3))/(2))]

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  12. If a cos A = b cos B, prove that the Delta ABC is either isosceles o...

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  13. In DeltaABC, prove that (cos 2A)/(a^(2))-(cos 2C)/(c^(2)) = (1)/(a^(2)...

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  14. If tan^(-1) x + tan^(-1)y + tan^(-1)z = pi show that : 1/(xy) + 1/(y...

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  15. Prove that: sin{tan^(-1)(1-x^2)/(2x)+cos^(-1)(1-x^2)/(1+x^2)}=1

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  16. If in a triangleA B C , (2cosA)/a+(cos B)/b+(2cosC)/c=a/(b c)+b/(c a) ...

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  17. In any DeltaABC, prove that : (a-b)/c = (sin, (A-B)/2)/(cos,C/2)

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  18. If the angles A,B,C of /\ABC are in A.P., and its sides a, b, c are in...

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  19. Prove that cot^(-1) 7 + 2 cot^(-1)3 = pi/4

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  20. In any triangle A B C , prove that following: \ (cos^2B-cos^2C)/(b+c)+...

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