Find the value of: sec² 30 + cosec² 30 - 1/2 tan² 45 - 8 sin² 90 please tell fast
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ANSWER
we know that tan45
∘
=cot45
∘
=sin90
∘
=1,cosec30
∘
=sec60
∘
=2,cos0
∘
=1
cosec30
∘
tan45
∘
+
cot45
∘
sec60
∘
−
2cos0
∘
5sin90
∘
=
2
1
+
1
2
−
2(1)
5(1)
=
2
1
+
1
2
−
2
5
=
2
1+4−5
= 0
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