Find the sign of expression sin100°+cos100°
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Posted by A@Kash Kumar 5 years ago
- 2 answers
Gaurav Seth 5 years ago
sin 100° + cos 100°
= sin100° + cos(90°+10°)
[cos 10° becomes sin 10°]
= sin100° + sin 10°
by the formula,
sin C + sin D = 2cos sin
= 2cos sin
= 2cos sin
= 2cos55° + sin45°
= 2cos55° + 1/√2
=√2.√2 cos55° .1/√2
= √2cos55°
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Jaya Jeevan 5 years ago
0Thank You