Question

(sin57/cos33)^2+(cos 42/sin 48)^2 -4 cos^2 45

Answer 1

Answer:

0

Step-by-step explanation:

={sin(90-33/cos 33)}^2+{cos(90-48/sin48)}^2-4(1/√2)^2. second step=(cos 33/cos 33)^2+(sin 48/sin48)^2-4×1/2. third step=1+1-2=0. answere=0