Prove that 4 cos 60 +4 tan 245- sin 230 = 4
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Answer:
5cos
2
60+4sec
2
30−tan
2
45
⇒
(
2
1
)
2
+(
2
3
)
2
5(
2
1
)
2
+4(
3
2
)
2
−(1)
2
⇒
4
1
+
4
3
4
5
+
3
16
−1
⇒
4
4
4
5
+
3
16
−1
⇒
12
3+64
=
12
67
.
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