If `a/b=4/5` and `b/c=(15)/(16)` , then `(c^2-a^2)/(c^2+a^2)` is (a)`1/7` (b) `7/(25)` (c) `3/4` (d) None of these

If (a)/(b)=(4)/(5)and(b)/(c)=(15)/(16) then (c^(2)-a^(2))/(c^(2)+a^(2)) would be (1)/(7) b.(3)/(4) c.(7)/(25) d.none of these

If (a)/(b)=(4)/(5) and (b)/(c)=(15)/(16), find the value of (c^(2)-a^(2))/(c^(2)+a^(2))

(3.5xx1.4)/(0.7)=?( a) 0.7(b)2.4(c)3.5(d)7.1 (e) None of these

If (a-b)=4 and ab=2, then (a^(2)+b^(2))=?( a) 18(b)20(c)25 (d) None of these

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

4(4)/(5)-:6(2)/(5)=?(3)/(4) (b) (5)/(7) (c) (5)/(8)(d)(7)/(11) (e) None of these

If tan theta=(3)/(4), then cos^(2)theta-sin^(2)theta=(7)/(25)(b)1(c)-(7)/(25) (d) (4)/(25)

If a : b = 2:3, b: c= 4:5 and c:d=6:7, then a:d=

If (a)/(2)=(b)/(3)=(c)/(4), then a:b:c=2:3:4(b)4:3:23:2:4(d) None of these

If (a)/(3)=(b)/(4)=(c)/(7), the value of (a+b+c)-:c is (a) (1)/(7)(b)(1)/(2)(c)2(d)7