Imporatant Trigonomentry Question: Quiz

1.( sinA+sinB)/(cosA-cosB) + (cosA+cosB)/(sinA-sinB) = ?
A. 0
B. sinAcosA
C. cosAcosB
D. tanA.tanB

2.Sin19°/cos71° + cos73°/sin17° = ?
A. 0
B. 1/2
C. 1
D. 2
3. If sin 17° = x/y , then the value of sec 17°-sin73° is :
A. (y^2-x^2)/xy
B. x^2//√y^2-x^2
C. x^2/y√y^2+x^2
D. x^2/y√y^2-x^2
4.The value of tan4°.tan43°.tan47°.tan86° is
A. 2
B. 3
C. 1
D. 4
5. If cos x + cosy=2 the value of sinx + siny is
A. 0
B. 1
C. 2
D. -4
6. The numerical value of cot18°
    (cot72°cos^2 22°+1/tan72°sec^2 68° is
A. 1
B. √2
C. 3
D. 1/√3
7. If sin (3x-20°)= cos(3x+20°) then the value of (x+y) is
A. 20°
B. 30°
C. 40°
D. 45°
8. If xsin45°= ycosec30°, then x^4/y^4 is eual to
A. 4^3
B. 6^3
C. 2^3
D.8^3

9.In a right -angled triangle xyz,right-angled at y, if xy= 2√6 and xz-yz=2, then secx+tanx is
A. 1/√6
B. √6
C. 2√6
D. √6/2
10. If tan 7xtan2x=1 ,then  the value of tan 3x is
A. √3
B. -1/√3
C. 1/√3
D. -√3
 
SOLUTION:

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