`sin (67(1)/(2))^(@)+cos(67(1)/(2))^(@)` is equal to

The value of tan^(-1)(1)+cos^(-1)(-1/2)+sin^(-1)(-1/2) is equal to-

If |x|le1 , then 2tan^(-1)x+sin^(-1)((2x)/(1+x^(2))) is equal to _____

cos^2 48^0-sin^2 12^0 is equal to

cos 1^(@) + cos2^(@) + cos 3^(@) + ….+cos 180^(@) is equal to

If tan(cos^(-1)x)="sin"(cot^(-1)(1/2)) then x is equal to- a. 1/sqrt(5) b. 2/sqrt(5) c. 3/sqrt(5) d. sqrt(5)/3

If cos("sin"^(-1)2/5+"cos"^(-1)x)=0 , then x is equal to _____

Find all number x , y that satisfy the equation (sin^2 x +(1)/( sin^(2) x))^(2)+( cos^(2)x+(1)/(cos^(2)x))^(2)=12+(1)/(2) siny.

The value of sin\ (1/2cot^(-1)(-3/4))+cos(1/2cot^(-1)(-3/4)) is/are equal to a. 1 b. (3sqrt(2))/(10) c. sqrt(2)sin(1/2cot^(-1)(-3/4)+cot^(-1)(1))\ d. 2sin(pi-tan^(-1)(1)-1/2tan^(-1)(4/3))

sin^(-1)(1-x)-2sin^(-1)x=pi/2 , then x is equal to