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Meaning of !

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Its is a sign of fractorial! Suppose for example lets take example of 6! (fractorial) 6×5×4×3×2×1!Thanks (2)
How solve Miscellaneous example no. 16 Complex no. In easy method

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Sir I want to ask that the additional math and main math are equal in commerce or same scope for additional and main math

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Cos square 45°sin square15°=squareroot 3/2

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What is the value of sin45

1/√2
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{tex}sin45°={1\over {\sqrt 2}}{/tex}
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One root twoThanks (1)
how to learn identities of trignometry

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In an isosceles trapezium ABCD ,if AB is parallel to CD ,show that angle ADC+ angle ABC =180°

tan15+cot15=4

Summative assessment 1 20162017question papers
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In a triangle ABC, tanA/2 = 5/6, tanB/2 = 20/37, then tanC/2 is equal to what?

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Formula for centroid of triangle

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C=({tex} {x_1+x_2+x_3\over 3}{/tex},{tex}{y_1+y_2+y_3 \over 3}{/tex})
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If A lies in the second quadrant and 3 tanA+4=0, the value of 2cotA 5cos A+sin A is equal to
(a) 53/10. (b) 23/10. (c) 37/10. (d) 7/10

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Cos210^o

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cos(90*2+30)° here Cos thita lie on the third quadrant so thita will be ve and value of cos 30° is under root3 by 2 so the value of cos210° is under root3 by 2Thanks (1)
Prove that : [1+secαcot(α+π/2)] [1+secα+cot(α+π/2)]2=2secα

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Value of 31pi/3

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In trigonometry,
31π/3
=31×180°÷3
=31×60°
=1860°
Or, in mensuration,
31π/3
=31×22/7÷3
=32.49
Thanks (2)
If sin a + sin b + sin c = cos a + cos b + cos c = 0 then prove that sin 3 a + sin 3 b + sin 3 c = 3 ( sin a+b+c /2)

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