Q14 of 180 Page 1

tan 10° tan 15° tan 75° tan 80° = _____.

We know that,

⇒


⇒


⇒


⇒ as


∴ The value of the given expression is 1.


More from this chapter

All 180 →
12

The distance of the point P (-6, 8) from the origin is ___ units.

 13

The first three terms of an AP are (3y – 1), (3y + 5) and (5y + 1), the value of y is _____.

OR


If 18, a, (b – 3) are in AP, then value of (2a – b) is ____.


 15

PA and PB are two tangents drawn from an external point P to a circle with centre C and radius 4 cm. If PA ⊥ PB, then length of each tangent is _______.

 16

Find the values of k for which the system of equations kx – y = 2, 6x – 2y = 3 has a unique solution.