`(cos^2 1^0-cos^2 2^0)/(2sin3^0 *sin1^0)` is equal to

The values of cos^2 73^0+cos^2 47^0-sin^2 43^0+sin^2 107^0 is equal to: (a) 1 (b) 1/2 (c) (sqrt(3))/2 (d) sin^2 73^@+cos^4 73^@

The values of cos^2 73^0+cos^2 47^0-sin^2 43^0+sin^2 107^0 is equal to: (b) 1/2 (c) (sqrt(3))/2 (d) sin^2 73^@+cos^4 73^@

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

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

Let x=sin1^0, then the value of the expression. 1/(cos0^0dotcos1^0)+1/(cos1^0dotcos2^0)+1/(cos2^0dotcos3^0)+1/(cos44^0dotcos45^0) is equal to (a) x (b) 1/x (c) (sqrt(2))/x (d) x/(sqrt(2))

Let x=sin1^0, then the value of the expression. 1/(cos0^0dotcos1^0)+1/(cos1^0dotcos2^0)+1/(cos2^0dotcos3^0)+1/(cos44^0dotcos45^0) is equal to (a) x (b) 1/x (c) (sqrt(2))/x (d) x/(sqrt(2))

Let x=sin1^0, then the value of the expression. 1/(cos0^0dotcos1^0)+1/(cos1^0dotcos2^0)+1/(cos2^0dotcos3^0)+1/(cos44^0dotcos45^0) is equal to (a) x (b) 1/x (c) (sqrt(2))/x (d) x/(sqrt(2))

The values of cos^(2)73^(0)+cos^(2)47^(0)-sin^(2)43^(0)+sin^(2)107^(0) is equal to: ( b) (1)/(2)(c)(sqrt(3))/(2) (d) sin^(2)73^(@)+cos^(4)73^(@)

The value of (cos24^(0))/(2tan33^(0)sin^(2)(57^(0)))+(sin162^(0))/(sin18^(0)-cos18^(0)tan9^(0))+cos162^(0) is equal to

Let x=sin1^(0), then the value of the expression.(1)/(cos0^(0)cos1^(0))+(1)/(cos1^(0)cos2^(0))+(1)/(cos2^(0)cos3)+(1)/(cos44^(0)cos45^(@)) is equal to (a) x (b) (1)/(x) (c) (sqrt(2))/(x) (d) (x)/(sqrt(2))