Considering Cosine rule, cos C is equal to
A). a² - b² - c²2bc
B). a² + b² - c²2ab
C). 2a + 2b - 2c2ac
D). 2a² + 2b² + 2c²2abc
a² + b² - c²2ab
a² + b² - c²⁄2ab
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1. The distance between the two poles of length 16 m and 9 m, is X m. If two angles of elevation of their respective top from the bottom of the other are complementary to each other, then the value X is∶
2. The sum of three consecutive natural numbers each divisible by 5, is 225. The largest among them is
3. If $\theta$ be a positive acute angle satisfying $cos^{2}\theta + cos^{4}\theta$ = 1, then the value of $tan^{2}\theta + tan^{4}\theta$ is
4. Two poles of equal height are standing opposite to each other on either side of a road which is 100m wide. Proma point between them on road, angle of elevation of their tops are $30^{0}$ and $60^{0}$ .The height of each pole (in metre) is
5. What is the value of 4cos330° + 2sec2 60° + tan260°sin2 45° - sin30°tan245° - 4/cosec360°?
6. The upper part of a tree broke at a certain height makes an angle of 60 ° with the ground at a distance of 10 m. from its feet. The original height of the tree was
7. Two circles touch each other externally. The distance between their centres is 7 cm. If the radius of one circle is 4 cm, then the radius of the other circle will be
8. Cosine Rule is also known as
9. .A train 110 metres long is running with a speed of 60 kmph . In what time will it pass a man who is running at 6 kmph in the direction opposite to that in which the train is going ?
10. If (a2 – b2) sin θ + 2abcosθ = a2 + b2, then tan θ
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