1.

Sin^2*62/cos^2*28-cos^2*59/sin^2*31-4cos^2*45

Answer»

ANSWER:

-2

Step-by-step EXPLANATION:

\frac{sin^2{62}}{cos^2{28}} - \frac{cos^2{59}} {sin^2{31}} - 4 cos²45

= \frac{sin^2{(90-28)}}{cos^2{28}} - \frac{cos^2{(90-31)}} {sin^2{31}} - 4 (\frac{<klux>1</klux>}{\sqrt{2} })²

= \frac{cos^2{28}}{cos^2{28}} - \frac {sin^2{31}} {sin^2{31}} - 4 (\frac{1}{{2} })

= 1 - 1 - 2

= -2


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