Sin A + sin B (sin a
sin A - sin B
cos A - cos B
COS )
or zero according as n is even or odd.
= 2 corn (A - B)
a)
tan
į B tan įC + tan įC tan į A + tan į A tanŻ B = 1
b)
sin 2A + sin 2B + sin 2C = 4 sin A sin B sin C
13. If A + B + C = Tt, prove that
a)
cos2A + cos2B + cos2 C = 1 - 2 cos A cos B cos C
b)
sina į A + sin? B + sin? įC = 1 – 2 sin A sinį B sin
sin c
Equations
12. If A + B + C = T, prove that

(x, y)→(x − 8, y − 7)

step-by-step explanation:

enjoy!

the answer would be 1 1/72

step-by-step explanation:

you can rewrite the equation by separating the parts and then solving individually:

10-9=1

1/8 - 1/9=

find l c d and then combine:

1 1/72

answer: i literally just answered this question but they want me to do it again

step-by-step explanation:

the answer is -1 for this question

step-by-step explanation: