Trig challenge problem: cosine of angle-sum

Trig challenge problem: cosine of angle-sum

Viewed: 0 time

Sal is given cos(θ) and cos(φ) and he finds cos(θ+φ). To do that, he must first find sin(θ) and sin(φ) using the Pythagorean identity.

ARIADNE Info
Source url:
https://cdn.kastatic.org/KA-youtube-converted/XGpEHj43kcc.mp4/XGpEHj43kcc.mp4
ARIADNE ID:
up2u_KHAN_ACADEMY_x6130cff9
ARIADNE provider:
KHAN_ACADEMY
ARIADNE repository:
K12
ARIADNE license:
Creative Commons Attribution/Non-Commercial/Share-Alike
Sal Khan


to add comments