Construct a triangle ABC in which BC=7cm,angle B =45°;angle C=100° measure angle A

Cot (A 15)-tan(A-15)= 4cos2a/1 2sin2A

How to identify whether to conjugate the given integral or not?

A wooden bookshelf has external dimensions as follows . Height=110cm, depth=25cm, breadth=85cm. the thickness of the plank is 5cm everywhere. The external faces are to be polished and the inner faces are to be painted.if the rate of polishing is 20 paise per square cm and the rate of painting is 10paise sq cm.find the total expenses required for polishing and painting the surface of the bookshelf

I am not able to understand the question 10
of exercise 9.4 of standard 11

Draw the triangle and construct for a triangle ABC, B=6cm,BC=7cm, and <A=60°

In this sum if x is 1. Then 30 can not fit. So how can we take it as median class? 

Find the had of 2098 and 999

Why

Tell this all in video

Please solve it

18th

Derivative of 3 sin x +2 sin α w.r.t.x

How

C.s.a of cone

Proof √2 irrational

Explain limits and derivatives in brief

Because i am weak in maths

D is a point on the side BC of equilateral in BC such that BD equal to 1 by 3 BC prove that 980 square equal to 7ab square