Cos 52 degree puls cos 68 degree plus cos 172 degree
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Hy there,
Cos52 degree + cos68 degree can be rewritten as 2cos(52+68)cos(68-52)/2
Which makes it 2cos60cos8
Implies 2×1/2 cos 8
Implies cos8
Now taking the rest of the equation,
Cos8+cos172
Cos8+cos(180-8)
Cos8-cos8
=0.
The answer is 0.
Formula applied= CosA + cosB =
2cos(A+B)/2 *cos(A-B)/2
Hope it helps.
Thanks.
Mark it brainliest if you understood.
Cos52 degree + cos68 degree can be rewritten as 2cos(52+68)cos(68-52)/2
Which makes it 2cos60cos8
Implies 2×1/2 cos 8
Implies cos8
Now taking the rest of the equation,
Cos8+cos172
Cos8+cos(180-8)
Cos8-cos8
=0.
The answer is 0.
Formula applied= CosA + cosB =
2cos(A+B)/2 *cos(A-B)/2
Hope it helps.
Thanks.
Mark it brainliest if you understood.
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