Question

Evaluate (sin 31 degree/cos 59 degree)2+(cos 59 degree/sin 31 degree)2- 4 sin2 45 degree

Answer 1

Answer:

zero(0)

Step-by-step explanation:

whenever sin & cos are complementary angle to each other they have same value

or cos(α) = sin(90-α)

therefore it may be evaluated as ...

(1)2 + (1)2 - 4 sin (2*45)

= 2 + 2 - 4. [sin90 = 1]

i.e.. tge answer will be zero(0)