If `xsin45^0cos^2 60^0=(tan^2 60^0cos e c\ 30^0)/(s e c 45^0cot^2 30^0),\ t h e n\ x=` `2` b. `4` c. `8` d. `16`

Evaluate : (sin50^0)/(cos40^0)+(cos e c40^0)/(sec50^0)-4cos50^0cos e c40^0

The value of cos e c10^0+cos e c50^0-cos e c70^0 is ____

If (tan69^0+t a n 66^0) /(1-tan69^@tan66^@)=2k ,\ t h e n\ k= -1 b. 1//2 c. -1//2 d. 17

If (xcos e c^2 30^0sec^2 45^0)/(8cos^2 45^0sin^2 60^0)=tan^2 60^0-tan^2 30^0, than x= (a) 1 (b) -1 (c) 2 (d) 0

Evaluate : 4(sin^4 30^0+cos^4 60^0)-2/3(sin^2 60^0-cos^2 45^0)+1/2tan^2 60^0

If P=(sin 300^0dottan 330^0dotsec 420^0)/(tan135^0dots in 210^0dots e c 315^0)& Q=(s e c 480^0dotcos e c 570^0t a n 330^0)/(sin 600^0dotcos 660^0dotcot 405^0) then Pa n dQ are respectively: 2, 16 (b) sqrt(2),(16)/3 -2,3/(16) (d) none of these

Evaluate the following expressions: (i) 2sin^2 30^otan60^o-3cos^2 60^osec^2 30^o (ii) "c o s e c"^2 30^osin^2 45^o-sec^2 60^o (iii) tan60^ocos e c^2 45^o + sec^2 60^otan45^o

If tan^2 45^@-cos^2 30^@=xsin45^@ \ cos45^@ , then x is (a) 2 (b) -2 (c) -1/2 (d) 1/2

Evaluate the following: 4(sin^4 60o+cos^4 30o)-3(tan^2 60o-tan^2 45o)+5cos^2 45o (ii) (cos e c^2 45osec^2 30o)(sin^2 30o+4cot^2 45o-sec^2 60o)

Evaluate the following (i) sin 60^@ cos30^@ + sin 30^@ cos 60^@ (ii) 2tan^2 45^@ + cos^2 30^@ - sin^2 60^@ (iii) (cos45^@)/(sec30^@ + c o s e c 30^@) (iv) (sin30^@ + tan45^@ - c o s e c 60^@ )/(sec30^@ + cos60^@ +cot45^@) (v) (5cos^2 60^@ + 4sec^2 30^@ - tan^2 45^@ )/ (sin^2 30^@ + cos^2 30^@ )