Question

19. Find the value of
Cot(20-theta) + Tan(70+theta)/
Sin(70+theta)
x Sin(20-theta)​

Answer 1

Answer:

Let cos(20-tetha) remain same..

Let us change Sin(70-tetha)

As we know that...

Sin(90-tetha)=Cos tetha

Sin(70-tetha)=Cos[90-(70+tetha)]

=Cos(20+tetha)

Cos(20-tetha) - Cos(20-tetha) = 0