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cos^2 20^@+cos^2 70^2 = 1....

`cos^2 20^@+cos^2 70^2 = 1`.

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UNITED BOOK HOUSE-DAULATPUR DALUICACHA BHARATI VIDYALAYA-EXERCISE
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  2. If two circles of radii 7 cm and 3 cm touch each other extermally, the...

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  3. cos^2 20^@+cos^2 70^2 = 1.

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  4. Write true or false: If the ratio of the total surface area of two cu...

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  5. Define Assumed Mean Method Formula elaborately.

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  7. What is the rate of simple interest per annum, when the interest of so...

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  8. Calculate the compound ratio of a:bc.b:ca and c:ab.

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  9. If 2x + 1/x = 2, then find the value of (x)/(2x^2+x+1).

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  10. PQ and AB are two equal chords of a circle with centre O, If anglePOQ=...

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  11. AB is the diameter of a semicircle with radius 4 cm in length and angl...

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  12. ABCD is a cyclic trapezium having AD||BC. If angleABC = 70^@ then angl...

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  13. If tan(theta+15^@)= sqrt3 then sin theta+ cos theta=?

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  14. If the number of surface of a cuboid is x, the number of edges is y, t...

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  15. If the numberical values of volume and curved surface area of a right ...

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  16. In a frequency distribution table, mean = 54, sunfixi = 2200+50k and s...

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