Question
If 7sin² ϕ + 3cos² ϕ = 4, then find the
value of ϕ ?Solution
7sin² ϕ + 3cos² ϕ = 4sin² ϕ + 3sin² ϕ +3cos² ϕ = 4 4sin² ϕ + 3(sin2 ϕ + cos2 ϕ) = 4 4sin²ϕ + 3 (1) = 4 4sin²ϕ + 4 - 3 = 1 4sin²ϕ = 1 sin²ϕ = 1/4 sin ϕ = 1/2 sin30° = 1/2 Hence, ϕ = 30
The message (A) from the top has only emboldened (B) those carried a knot (C) against the minorities in the heart but could not express (D) it in the pu...
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- In each sentence below, four words have been printed in bold which are numbered (1), (2), (3), and (4). One of these words may be misspelt or inappropriate...
In each question below, a sentence is given with a part of it printed in bold type. That part may contain a grammatical error. Each sentence is followe...
1) depraive
2) deprave
3) deprayve
4) deprawve
5) none of these
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In the following questions, four words are given in bold. One of them may be incorrectly spelt. Identify the incorrectly spelt word. If all are correct...
In each of the questions below, a sentence is given with four words highlighted in bold in the sentence. Among these bold words, one may be wrongly spe...
In each of the questions below, a sentence is given with four words highlighted in bold in the sentence. Among these bold words, one may be wrongly spe...
Select the appropriate answer.
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