plzz solve these 3 questions
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Answer:
4) 0
5)2
6)2
Step-by-step explanation:
4.={cos (90°-31°)}2- sin2 59°
=sin2 59°-sin2 59°
=0
5.or, tanA - 1/tanA =2
or, tan2A - 1 =2tanA
or, (tanA - 1) = 0
or, tan A = 1
.: cot A = 1
.:tan2 A+cot2 A= (1)2 + (1)2
= 1+1
=2
6)= (sin2 theta+cos2theta) + 2 sin theta ×cos theta + (sin2theta +cos2 theta) - 2 cos theta × sin theta
= (1+1)
= 2
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