Can someone please solve the 3rd question both the parts
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Answer: PLZZ MARK AS BRAINLIEST
Step-by-step explanation:
1) cot²Ф - 1/sin²Ф
cot²Ф - cosec²Ф (1/sinФ = cosecФ)
we know that cosec²Ф - cot²Ф = 1
∴cot²Ф - cosec²Ф = -1
2) sinФ= cosФ
sinФ is equal to cos Ф only if the value of Ф= 45°
∴ 2 tanФ + cos²Ф
= 2 tan 45° + cos² 45°
= 2(1) + (1/√2)² ( tan 45° = 1 , cos 45° = 1/√2)
= 2 + 1/2 = 5/2
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