If `3alpha=90^@` then the value of `sinalpha` is
`(A) 1/sqrt3`
`(B) sqrt3/4`
`(C) 1/2`
`(D) sqrt3/2`

The value of sin 60 is: A. sqrt 1//2 B. sqrt 3//2 C. 1//sqrt 2 D. sqrt""1//sqrt""2

The value of tan 45^@ (A) sqrt3 (b) frac(sqrt3)(2) (C) frac(1)(sqrt3) (D) 1

If x = 5+2sqrt6 , then the value of (sqrtx +frac(1)(sqrtx)) is (A) 2sqrt2 (B) 3sqrt2 (C ) 2sqrt3 (D) 3sqrt3

If tan alpha = sqrt3+2 , then the value of tan alpha - cot alpha is

Evaluate : Find the value of sqrt( 3 + sqrt(5)) a ) sqrt(3)/2 + 1/sqrt(2) b ) sqrt(3)/2 - 1/2 c ) sqrt(5)/2 - 1/sqrt(2) d ) sqrt(5)/sqrt(2) + 1/sqrt(2)

If tan15^@=2-sqrt3 , then the value of cot^2""75^@ (a) 7+sqrt3 (b) 7-2sqrt3 (c) 7-4sqrt3 (d) 7+4sqrt3

The value of cot70^(@)+4cos70^(@) is (a) (1)/(sqrt(3)) (b) sqrt(3)(c)2sqrt(3)(d)(1)/(2)

The value of cos (1110^@) is A. sqrt3//2 B. 1//2 C. 1//sqrt2 D. 1

If A,B,C are the angles of a given triangle ABC . If cosA.cosB.cosC= (sqrt3-1)/8 and sinA.sinB.sinC= (3+sqrt3)/8 The value of tanA+tanB+tanC is (A) (3+sqrt(3)/(sqrt(3)-1)) (B) (sqrt(3)+4/(sqrt(3)-1)) (C) (6-sqrt(3)/(sqrt(3)-1)) (D) (sqrt(3)+sqrt(2)/(sqrt(3)-1))