ABC Electronics sells an 8 pack of AA batteries for $5.60. Better Batteries sells a pack of 15 AA batteries for $10.80. Which st
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<h3>What is Trigonometry?</h3>Trigonometry is a branch of mathematics that studies relationships between the sides and angles of triangles.
1. (cos x. cos y)(tan x + tan y) = sin (x+ y)
(cos x. cos y)(tan x + tan y)
= cos x. cos y (sinx/ cos x + sin y/ cos y)
= sin x cos y + sin y cos x
= sin (x+ y) [ sin ( x +y)]= sin x cos y + sin y cos x
= RHS
3.
Using identity
cos ² x=0
Applying then x=0
So, cos x =0
General solution will be .
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