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a triangle A B C with fixed base B C , t...

a triangle `A B C` with fixed base `B C` , the vertex `A` moves such that `cosB+cosC=4sin^2(A/2)dot` If `a ,b and c ,` denote the length of the sides of the triangle opposite to the angles `A , B and C` , respectively, then (a) `b+c=4a` (b) `b+c=2a` (c) the locus of point `A` is an ellipse (d) the locus of point `A` is a pair of straight lines

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CENGAGE PUBLICATION-TRIGONOMETRIC FUNCTIONS-All Questions
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  2. The set of all x in ((-pi)/2,pi/2) satisfying |4sinx-1| < sqrt(5) ...

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  3. a triangle A B C with fixed base B C , the vertex A moves such that co...

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  4. Prove that tan 70^@=tan 20^@+2tan50^@

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  5. Show that the equation sintheta=x+1/x is not possible if x is real.

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  6. Solve: 2sin^2x+sin^2 2x=2

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  8. The upper 3/4 th portion of a vertical pole subtends an angle theta su...

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  9. Solve (log)(tanx)(2+4cos^2x)=2

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  10. If f(x)=cos^2x+s e c^2x ,then

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  11. Match the statements/expressions given in Column I with the values giv...

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  12. prove that sintheta.sec3theta+sin3theta.sec3^2theta+sin3^2theta.sec3^3...

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  13. Solve 4cot2theta=cot^2theta-tan^2theta

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  14. Find the range of f(x)=sin^2x-3sinx+2

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  15. In a triangle DeltaXYZ, let a,b and c be the lengths of the sides opp...

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  18. Find the general solutions of: 2^(1 + abscosx + abs(cosx)^2 + abs(co...

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