Question

( sin 25° / cos 65°) square + ( cos 65° /sin 25°) square - 2 cos 60°​

Answer 1

Answer:

Step-by-step explanation:

sin( A + B ) = sinAcosB + cosAsinB

Given us,

sin25cos65 + cos25sin65

= sin( 25 + 65 )

= sin90

= 1

Hope it helps.

Answer 2

Answer:

(Sin(90°-65°)/cos65°)^2+(cos(90°-25°)/sin25°)^2-2(1/2). (cos60°=1/2)

(sin(90°-θ) =cosθ)

(cos(90°-θ)=sinθ)

(cos65°/cos65°)^2+(sin25°/sin25°)^2-1

(1)^2+(1)^2-1

1+1-1

2-1

1...ans.