The value of `cos^(2)17^@-sin^(2)73^@` is

The value of cos^(2)17o-sin^(2)73o is (a) 1 (b) (1)/(3) (c) 0(d)-1

Find the value of cos^2 17^@ -sin^2 73^@

If sin 17^@ = x/y ,then the value of sec 17^@ - sin 73^@ is

If sin17^(@)=(a)/(b) then value of sec17^(@)-sin73^(@) is

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 4(cos^(2)73+cos^(2)47+cos73*cos47)

The value of (cos2^@ + sin2^@)/(cos2^@-sin2^@) is ___

Find the value of (2sin^(2)63^(@)+1+2sin^(2)27)/(3cos^(2)17^(@)-2+3cos^(2)73^(@))

What is the least value of 15cos^(2)theta+17sin^(2)theta ?