Double Angle Identities - Trigonometry - Socratic
Double Angle Identities. #sin2theta=2sin theta cos theta# #cos2theta=cos^2theta-sin^2theta=2cos^2theta-1=1-2sin^2theta#
Fundamental Identities - Trigonometry - Socratic
"The fundamental trigonometric identities" are the basic identities: •The reciprocal identities •The pythagorean identities
What is sin(-theta) in terms of sintheta? - Socratic
2018年4月28日 · sin(-theta) = -sintheta -theta means that your angle is in the fourth quadrant for sine, it is negative in the fourth quadrant SO sin(-theta) = -sintheta
How do you solve #Sin 3 theta = sin theta - Socratic
2016年6月10日 · #= sin theta * (1-2sin^2 theta) + 2sin theta * (1-sin^2 theta)# #= 3sin theta - 4 sin^3 theta# Applying this to our equation, we get #3sin theta - 4 sin^3 theta = sin theta# or #2sin theta - 4sin^3 theta = 0# or #sin theta*(1-2sin^2 theta) = 0# This equation has one set of solutions when #sin theta = 0#, that is (Solution 1.1) #theta = 0+2pi n ...
Prove that sin theta/1-cos theta +tan theta /1+cos theta=sec theta ...
2018年2月21日 · Proof of the trigonometric identity involving sin, cos, tan, sec, and cot functions.
Basic Trigonometric Functions - Trigonometry - Socratic
The six basic trigonometric functions are: 1. Sine, #sintheta# 2. Cosine, #costheta# 3. Tangent, #tantheta# 4. Cotangent, #cott
How do you simplify #sin(theta/2)# using the double angle
2017年6月5日 · How do you simplify #sin(theta/2)# using the double angle identities?
How do you express sin 3theta in terms of trigonometric ... - Socratic
2018年1月4日 · We can use de Moivre's formula: #(cos theta + i sin theta)^n = cos n theta + i sin n theta# as follows: #cos 3 theta + i sin 3 theta#
Proving Identities - Trigonometry - Socratic
The best videos and questions to learn about Proving Identities. Get smarter on Socratic.
What is #sin(x-90)#? - Socratic
2015年12月17日 · Use the sine angle subtraction formula: #sin(alpha-beta)=sin(alpha)cos(beta)-cos(alpha)sin(beta)# Therefore, #sin(x-90˚)=sin(x)cos(90˚)-cos(x)sin(90˚)#