Question

If tan θ = 3/4 then cos²θ – sin² θ is
(a) 4/25
(b) 7/25
(c) 4/5
(d) 5/8

Answer 1

answer is d,because
if tan is3/4 it means that it's height would be 3 or base 4 than hypotenuse is 5
so
(4/5)×(4/5)-(3/5)(3/5)
16/25-9/5
7/5