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What are the 3 basic components of communication?

The communication system consists of three basic components: transmitter, channel and receiver. The transmitter does the modulation of the message... View Article

Is Lead heavier than steel?

Yes, lead is heavier than steel. The density of steel is 8gm/cc and the density of lead is 11.3 gm/cc.

tan^-1 1 / ?x² – 1 =

1) (π / 2) + cosec-1 x 2) (π / 2) + sec-1 x 3) cosec-1 x 4) sec-1 x... View Article

tan^-1 [cos x] / [1 + sin x] =

1) (π / 4) – (x / 2) 2) (π / 4) + (x / 2) 3) x / 2... View Article

sec^-1 (sec (- 30^o)] =

1) – 60o 2) – 30o 3) 30o 4) 150o Solution: (3) 30o sec-1 (sec (- 30o)] = sec-1 (sec... View Article

tan [sec^-1 ?1 + x²] =

1) 1 / x 2) x 3) 1 / √1 + x2 4) x / √1 + x2 Solution: (2)... View Article

cos (tan^-1 x) =

1) √1 + x2 2) 1 / √1 + x2 3) 1 + x2 4) None of these Solution: (2)... View Article

tan^-1 x / ?a² – x²

1) (1 / a) sin-1 (x / a) 2) a sin-1 (x / a) 3) sin-1 (x / a) 4)... View Article

tan^-1 [(?1 + x²) – 1] / x =

1) tan-1 x 2) (1 / 2) tan-1 x 3) 2 tan-1 x 4) None of these Solution: (2) (1... View Article

If sin^-1 (1 / 2) = tan^-1 x, then x =

1) √3 2) 1 / √3 3) 1 / √2 4) None of these Solution: (2) 1 / √3 sin-1... View Article

1 + cot² (sin^-1 x) =

1) 1 / 2x 2) x2 3) 1 / x2 4) 2 / x Solution: (3) 1 / x2 Let... View Article

cot^-1 (- ?3) =

1) – π / 6 2) 5π / 6 3) π / 3 4) 2π / 3 Solution: (2) 5π /... View Article

cos (sin^-1 (5 / 13)) =

1) 12 / 13 2) – 12 / 13 3) 5 / 12 4) None of these Solution: (1) 12... View Article

sin (cot^-1 x) =

1) √1 + x2 2) x 3) (1 + x2)-3/2 4) (1 + x2)-1/2 Solution: (4) (1 + x2)-1/2 Let... View Article

If cos^-1 (1 / x) = ?, then tan ? =

1) 1 / √x2 – 1 2) √x2 + 1 3) √1 – x2 4) √x2 – 1 Solution: (4)... View Article

If f (x) = sin^-1 [(?3 / 2) x – (1 / 2) ?1 – x²], – 1 / 2 ? x ? 1, then f (x) =

1) sin-1 (1 / 2) – sin-1 x 2) sin-1 x – (π / 6) 3) sin-1 x + (π... View Article

The principal value of cos^-1 {(1 / ?2) [cos (9? / 10) – sin (9? / 10)]} is

1) 3π / 10 2) 17π / 20 3) 7π / 10 4) none of these Solution: (2) 17π / 20 {(1... View Article

The number of real solutions of ?1 + cos 2x = ?2 sin^-1 (sin x), – ? ? x ? ? is

1) 0 2) 1 3) 2 4) ∞ Solution: (3) 2 The given equation becomes |cos x| = sin-1 (sin... View Article

The solution set of the equation cos^-1 x – sin^-1 x = sin^-1 (1 – x) is

1) [-1, 1] 2) [0, 1 / 2] 3) [-1, 0] 4) none of these Solution: (4) none of these... View Article

If sin^-1 x + sin^-1 y = 2? / 3, cos^-1 x – cos^-1 y = – ? / 3, then the number of values of (x, y) is

1) 2 2) 4 3) 0 4) none of these Solution: (4) none of these (π / 2) + sin-1... View Article

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