Monday

September 22, 2014

September 22, 2014

Posted by **chama** on Wednesday, March 14, 2012 at 11:02am.

- maths -
**Reiny**, Wednesday, March 14, 2012 at 11:08amprove sin (3Ø) = 3sin Ø - 4sin^3 Ø

LS = sin(2Ø + Ø)

= sin2Ø cosØ + cos2ØsinØ

= 2sinØcosØcosØ + (1-2sin^2 Ø)sinØ

= 2sinØ(1-sin^2 Ø) + sinØ - 2sin^3 Ø

= 2sinØ - 2sin^2 Ø + sinØ - 2sin^3 Ø

= 3sinØ - 4sin^2 Ø

= RS

**Answer this Question**

**Related Questions**

maths - show that sin3theta-cos2theta =(1-sin theta)(4sin squared theta + 2sin ...

maths - show that sin3theta-cos2theta =(1-sin theta)(4sin squared theta + 2sin ...

aljebra - Solve the equation for cos(3theta/2).tan(3theta/2)

math - If 3 tan theta = 4, then evaluate : 3sintheta + 2costheta / 3sintheta – ...

trig - Solve the equation for cos(3theta/2).tan(3theta/2)for greater than or ...

trig - draw the graph of 4sin(x+30) and 2+tanx for values of x from 0 degree to ...

maths - I'm reviewing for my exams, and I was sure that I was comfortable with ...

maths - If the sum of the squares of the roots of the quadratic equation ax^2 + ...

MATHS - fIND THE VALUE OF THETA,given that theta is greater than zero but less ...

Pre-Calculus - what is the range of each of these equations? 1. 4sin(3x-1)+4 2...