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cos^(4)x-sin^(4)x=……….. ....

`cos^(4)x-sin^(4)x=`……….. .

A

`2sin^(2)x-1`

B

`2cos^(2)x-1`

C

`1+2sin^(2)x`

D

`1-2cos^(2)x`

Text Solution

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The correct Answer is:
B
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FULL MARKS-TRIGONOMETRY-ADDITIONAL QUESTIONS SOLVED
  1. sin(90^(@)-theta)costheta+cos(90^(@)-theta)sintheta=………… .

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  2. 1-(sin^(2)theta)/(1+costheta)=…………. .

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  3. cos^(4)x-sin^(4)x=……….. .

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  4. If tantheta=a/x, then the value of x/(sqrt(a^(2)+x^(2))) =………… .

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  5. If x=asectheta,y=btantheta, then the value of x^(2)/a^(2)-y^(2)/b^(2)=...

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  6. sectheta/(cottheta+tantheta)=………… .

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  7. (sin(90^(@)-theta)sintheta)/tantheta + (cos(90^(@)-theta)costheta)/cot...

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  8. In the adjoining figure, AC = ……….. .

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  9. In the adjoining figure, / ABC = ……….. .

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  10. A man is 28.5 m away from a tower. His eye level above the ground is 1...

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  11. In the adjoining figure, sintheta=15/17. Then BC=……… .

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  12. (1+tan^(2)theta)(1-sintheta)(1+sintheta)=………… .

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  13. (1+cot^(2)theta)(1-costheta)(1+costheta)=……… .

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  14. (cos^(2)theta-1)(cot^(2)theta+1)+1=………….. .

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  15. (1+tan^(2)theta)/(1+cot^(2)theta)=

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  16. The value of sin^(2)theta+(1)/(1+tan^(2)theta) is equal to

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  17. 9tan^(2)theta-9sec^(2)theta=………… .

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  18. If the ratio of the height of a tower and the length of its shadow is ...

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  19. A ladder makes an anglesof 60^(@) with the ground when placed against ...

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  20. The angle of depression of a car parked on the road from the top of th...

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