Question

Solve these questions
Pls

Answer 1

Answer:

1)tan7°×tan83°×tan67°×tan23°×tan660°

tan7°×cot7°×tan67°×cot67°×√3

=√3

2) cos80°/sin10°+cos59°×sec59°

=1+1=2

3) cosec20°sin20°-cos20°sec20°

=1-1

=0

4) (sin65°+cos25) (sin65°-cos65°)

(sin^2 65°-cos^2 25°)

(sin^2 65-sin^ 65°) =0