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

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

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

If cos theta + cos^2 theta = 1, then value of sin^2 theta + sin^4 theta is (a) -1 (c) 0 (c) 1 (d) 2

The value of sin^2 75^0-sin^2 15^0 is a. 1//2 b. sqrt(3)//2 c. 1 d. 0

If sinA+sin^2A=1, then the value of cos^2A+cos^4A is (a)2 (b) 1 (c) -2 (d) 0

The value of sin^(2)75^(@)-sin^(2)15^(0) is 1/2 b.sqrt(3)/2 c.1 d.0

The value of (cos^3 20^@-cos^3 70^@)/(sin^3 70^@-sin^3 20^@) is (a) 1/2 (b) 1/(sqrt(2)) (c) 1 (d) 2

The value of tan[cos^(-1)(4/5)+tan^(-1)(2/3)] is 6/(17) (b) 17/(6) (c) (16)/7 (d) none of these

The value of cos 15^(@) - sin 15^(@) is equal to .................. A) (1)/(sqrt2) B) (1)/(2) C) -(1)/(sqrt2) D) 0

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^@