Help with ratios of double angle problem!! (1 Viewer)

ScienceGuy99

Member
Joined
Mar 30, 2016
Messages
83
Location
Australia, NSW.
Gender
Male
HSC
2017
Hi there! Prelim extension 1 :)

I can't understand (or get the answer for) question 7a in exercise 6.15 in the maths in focus textbook.

For those without that textbook, the question is:

"By writing 3x as 2x + x, find an expression in terms of x for:
a) Sin3x"

The answer is (3sinx)(cos^2x) - sin^3x

I'm substituting theta for x because I can't type theta haha
 

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

Top