Question

plzz solve these 3 questions
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Answer 1

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