Question
If 8cos 2 A + 3sin 2 A = 9, then
calculate the value of (sec 2 A - 1).Solution
8cos 2 A + 3sin 2 A = 9
Or, 5cos 2 A + 3cos 2 A + 3sin 2 A = 9
Or, 5cos 2 A + 3 X (cos 2 A + sin 2 A) = 9
Or, 5cos 2 A + 3 = 9 (Using, cos 2 A + sin 2 A = 1)
Or, 5cos 2 A = 6
Or, cos 2 A = (6/5)
So, sec 2 A = (5/6) (sec X is reciprocal of cos X)
Required value = (5/6) - 1 = (- 1/6)
Which of the following factors is NOT considered a major challenge for the Indian economy in achieving sustained high economic growth?
Indian cricket legend Sachin Tendulkar will start a new innings in August 2023 as the Election Commission of India’s national icon for voter awareness...
Under the National Education Policy of 2020, the old 10+2 structure will be replaced by a __________ framework.
In India, which of the following regulatory mechanisms was NOT in existence to enforce regulation of the industrial sector?
When Pitt's India Act was passed?
If B is coded = 4, D is coded = 8, and E is coded = 10, then what will be the code for J?
Which of the following dances evolved from ‘Ekaharya Lasyanga’?
Which country declined the invitation to join the BRICS group among the six nations that were extended invitations?
In how many phases, General Election to Lok Sabha-2019 was conducted in India?
Which Indian state is using drone technology and a digital platform to revive the PM-KUSUM programme?
Relevant for Exams:
