that 10 10 degree tan 15 degree tan 75 degree 10 80 degree equal to 1
Answers
Answered by
0
Step-by-step explanation:
tan10°×tan15°×tan75°×tan80°
=tan10°×tan15°×(90×1-15)°×(90×1-10)°
=tan10°×tan15°×(-cot15°)×(-cot10°)
=1;[Proved]
Similar questions